The concept combined gas law is used here to determine the new volume of the gas. The new volume of the gas is 28.23 L.
What is combined gas law?The combined gas law gives the relationship between the pressure, volume and absolute temperature of a fixed quantity of gas. In combined gas law, only the amount of gas is held constant.
The combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law. It is found to be an amalgamation of three previously discovered laws.
The combined gas law is given as:
PV/T = k (Constant)
For two different gases, the law is:
P₁V₁ / T₁ = P₂V₂ / T₂
V₂ = P₁T₂V₁ / P₂T₁
= 9.2 × 400 × 27.5 / 12.8 × 280
= 28.23 L
Thus the new volume of gas is 28.23 L.
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A chemistry teacher provides students with the amount of potassium hydroxide they need in solution form. The teacher makes the solution by dissolving 42. 1 g koh into 3. 0 l of solution.
Answer:For the enough dissolving of given moles each group will need to provide 92mL of solution.
Explanation: Molarity can be calculated as: M=n/V mol/L where, V=volume=3L(given)
n=no. of moles, which can be calculated as:
n=W/M, where
W= given mass=42.1g(given)
M=molar mass= 56.1g/mol (known)
We have to calculate molarity to determine the volume of solution of each groups. By putting value of n in the 1st equation, molarity can be calculated as M=42.1/56.1x3=0.250 mol/L.
It is given that each group has KOH solution of 0.023 moles. So, we can calculate the volume by using the 1st equation. M=n/V
0.250=0.023/V
V=0.023mol/0.250mol per L=0.092L=92ml
92ml of the solution will each group need to provide enough dissolved moles.
PLS HELP ASAP
(50 POINTS)
The reaction C(s) + O₂ (g) → CO₂ (s) has a AH=-394kJ .
How much heat will be required to produce 1 mole of Fe by the reverse reaction?
A) -394 kJ
B) -197 kJ
C) 394 kJ
D) 788 kJ
Answer: The answer is A) -394
Explanation:
This worked for me
Ammonium perchlorate is a powerful solid rocket fuel, used in the Space Shuttle boosters. It decomposes into nitrogen gas, chlorine gas, oxygen gas and water vapor, releasing a great deal of energy. Calculate the moles of nitrogen produced by the reaction of 1.6 mol of ammonium perchlorate.
Answer:
the answer is 1.6 moles.
Explanation:
The balanced chemical equation for the decomposition of ammonium perchlorate is:
NH4ClO4 → N2(g) + 2H2O(g) + Cl2(g) + 3O2(g)
From the balanced equation, we can see that for every 1 mole of ammonium perchlorate decomposed, 1 mole of nitrogen gas is produced.
Therefore, if we decompose 1.6 moles of ammonium perchlorate, we will produce 1.6 moles of nitrogen gas.
So the answer is 1.6 moles.
1. determine the ph and percent ionization for a 0.0500 m hno2 solution. the ka for hno2 is 3.94 x 10-4 .
The 0.0500 M HNO2 solution has a pH of 1.81 and a 44.5% ionisation percentage.
What is pH and how is it determined?A solution's acidity or basicity is determined by its pH. It is described as the solution's hydrogen ion concentration's negative logarithm. While lower pH values denote acidity and higher ones denote basicity, a pH of 7 is regarded as neutral.
Since HNO2 is a weak acid, the percent ionisation and pH of the solution can be determined using the acid dissociation constant (Ka) formula.
Ka = (H+)(NO2-)/(HNO2)
We can write: Ka = x2 /, where x is the concentration of H+ and NO2- and (0.0500-x) is the concentration of HNO2 (0.0500 - x)
The quadratic formula is used to solve for x, and the result is x = 0.0154 M
For these reasons, [H+] = [NO2-] = 0.0154 M and [HNO2] = 0.0346 M.
We apply the formula: to determine the % ionisation.
% ionisation is calculated as [H+]/[HNO2] x 100%, or (0.0154 / 0.0346) x 100, or 44.5%
We use the following formula to determine pH:
pH = -log(0.0154) = 1.81 where pH = -log(H+)
As a result, the 0.0500 M HNO2 solution has a pH of 1.81 and a 44.5% ionisation percentage.
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true/false. hox genes hox genes control which amino acids get plugged into polypeptide chains. control the development of language in humans. function only in fruit flies. appear to function in similar ways across diverse groups of organisms.
The rate constant at 325°C for the decomposition reaction C4H8 ⟶ 2 C2H4 is 6.1×10−8
s^−1, and the activation energy is 261 kJ per mole of C4H8. Determine the frequency factor for the reaction.
The concept Arrhenius equation is used here to determine the frequency factor for the reaction. Here for the given reaction, the frequency factor is 3.814.
What is Arrhenius equation?The Arrhenius equation explains the relationship between the activation energy and rate of the reaction. The lower the activation energy, higher will be the rate of reaction. The equation is:
[tex]k=A . e^{-E_{a} } / RT[/tex]
k - rate constant
A - frequency factor
Eₐ - activation energy
R - Gas constant
T - Temperature in Kelvin
261 kJ per mole = 261000 J/mol
325°C + 273 = 598 K
6.1 × 10⁻⁸ = A . e⁻261000/ 8.314 × 598
A = 3.814
Thus the frequency factor for the reaction is 3.814.
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which of the following resonance structures is the least important contributor to the resonance hybrid of the formate anion, hcoo-
The odd one out is Structure C, which essentially possesses none of the traits of a significant resonance structure.
Which resonance structure from the list below makes the biggest contribution to the resonance hybrid?The resonance hybrid will be most influenced by the resonance form with the lowest formal charges. In a molecule, an atom is given a formal charge. The resonance structure is more stable as formal charges decrease.
Which of the following resonance structures is the least stable?The negative charge on the carbon atom connected to the NH2 group, which is an electron donor by nature, makes Structure (A) the least stable resonant structure and will lead the molecule to become unstable.
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The cooled sugar solution is (ideally) glassy in luster and fracture pattern, aphanitic with respect to crystal size, and vesicular. Choose all of the following household materials that have a similar luster or texture.
A. Window glass
B. Wooden cutting board
C. Cardboard, cereal box type
D. Ceramic plate
E. Styrofoam cup
F. Steel knife
G. Aluminum baking dish
There can be more than one selection.
This cooled sugar solution has glassy in luster & fracture pattern, aphanitic in regard to crystal, or vesicular. Glass, a wooden cutting board, or an aluminum baking dish are typical of these materials.
What is glassy behavior?Several soft materials, such as microparticles, foams, emulsions, or other complex fluids, exhibit glassy behavior, including plastics, superalloys, magnetic spin spectacles, disordered conductors, and many soft materials. Glassy phenomena are also present in very many biology, most notably protein.
What does glassy texture mean?This rock has a glassy appearance if it resembles a slab of (colored) glass and lacks mineral crystals that may be seen. The glassy texture gives the impression that cooling was so rapid that no crystalline could form.
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For this question, choose three answers. What are the possible molar ratios for h3po4?.
Answer:
3:1:4
6:2:8
9:3:12
Explanation:
The possible molar ratios for H3PO4 can be determined by looking at the subscripts in the chemical formula.
The chemical formula for H3PO4 indicates that it contains 3 hydrogen atoms, 1 phosphorus atom, and 4 oxygen atoms. Therefore, the possible molar ratios for H3PO4 are:
- 3 moles of H atoms : 1 mole of P atom : 4 moles of O atoms
- 6 moles of H atoms : 2 moles of P atom : 8 moles of O atoms
- 9 moles of H atoms : 3 moles of P atom : 12 moles of O atoms
So the possible molar ratios for H3PO4 are:
- 3:1:4
- 6:2:8
- 9:3:12
Determine the theoretical yield if a 125.0g sample of zinc was used.
Determine the percent yield if 515.6g of product is recovered.
The percent yield is 85%
What is the percent yield?The percent yield is a measure of the efficiency of a chemical reaction, calculated by comparing the actual yield of a reaction to the theoretical yield. The theoretical yield is the amount of product that would be produced if the reaction went to completion, based on stoichiometric calculations using the amounts of reactants and products in the balanced chemical equation.
The reaction equation is;
Zn + I₂ → ZnI₂
Number of moles of Zn = 125.0g/65 g/mol
= 1.9 moles
Since the reaction is 1:1
Mass of the ZnI₂ produced = 1.9 moles * 319 g/mol
= 606.1 g
Thus percent yeild = Actual/Theoretical * 100/1
= 515.6/606.1 * 100/1
= 85%
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Missing parts;
Zinc reacts with iodine in a synthesis reaction. Using a balanced chemical equation for the reaction, determine the percent yield of a 125.0gram sample of zinc was used and 515.6 grams of product is recovered
What volume of water would you need to dissolve 72 grams of salt at 25 degrees Celsius? (show work)
To need 200 milliliters volume of water to dissolve 72 grams of salt at 25°C.
In water at 25 degrees Celsius, what is soluble?All sodium, potassium, and ammonium salts are soluble. All nitrates, acetates and perchlorates are soluble. Every salt of silver, lead, and mercury(I) is insoluble. Iodides, bromides, and chlorides are all soluble in water.
Why does water become liquid at 25 °C?The water molecules are dipolar due to the substantial polarity difference between oxygen and hydrogen. As a result, a hydrogen bond forms between the H and O of nearby water molecules. It is this powerful hydrogen bond, which compacts the water molecules firmly together, that causes water to be a liquid at normal temperature.
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Consider the following mechanism.
O3 → O2 + O (slow) O3 + O → 2O2 (fast)
a. Write the overall balanced chemical equation.
b. Identify any intermediates within the mechanism.
c. What is the order with respect to each reactant?
d. Write the rate law for the overall reaction.
Answer:
a. The overall balanced chemical equation for the reaction is: 3O3 → 3O2 + O b. The intermediate in the mechanism is O3. c. The order of the reaction is first order with respect to O3 and second order with respect to O. d. The rate law for the overall reaction is rate = k[O3]^1[O]^2.
which of the following options describe the correct format used to represent an ionic compound? select all that apply.
For binary ionic compounds (ionic compounds that include only two kinds of elements), the compounds are named via writing the title of the cation first observed with the aid of the name of the anion. For example, KCl, an ionic compound that incorporates K⁺ and Cl⁻ ions, is named potassium chloride.
Which of the following describes an ionic compound?Answer and Explanation: Option A is the right reply as ionic compounds are made of positively-charged cations and negatively-charged anions. The ensuing electrostatic appeal between the oppositely charged ions is what creates the ionic bond.
What are the 4 kinds of ionic compounds?Binary Ionic Compounds Containing a Metal and a Nonmetal. A binary compound is a compound formed from two one-of-a-kind elements. ...
Ionic Compounds Containing a Metal and a Polyatomic Ion. Metals combine with polyatomic ions to provide ionic compounds. ...
Acids and Acid Salts. ...
Binary Compounds Between Two Nonmetals.
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How many g KCl are produced if 3.3 mol O₂ is produced?
The concept stoichiometry is used here to determine the mass of KClO₃ produced from 3.3 mol of oxygen . The mass of KClO₃ produced is 269.61 g.
What is stoichiometry?
The stoichiometric concept is generally used for the calculations of masses and sometimes the volumes and reactants and products involved in a chemical reaction. The relationship between the amounts of reactants and products can be obtained in a chemical reaction.
The reaction is:
2KCl + 3O₂ → 2KClO₃
The number of moles of KClO₃ formed is:
3.3 mol O₂ × 2 mol KClO₃ / 3 mol O₂ = 2.2 mol KClO₃
The molar mass of KClO₃ = 122.55 g/mol
The mass of KClO₃ = 2.2 mol × 122.55 g/mol = 269.61 g
Thus the mass of KClO₃ formed is 269.61 g.
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Your question is incomplete, but most probably your full question was.
How many g KClO₃ are produced if 3.3 mol O₂ is reacted?
If 0.05 mol of N-acetylsulfonilyl chloride are moed with 16 mi. of a 30% ammonium hydroxide solution, approximately how many equivalents of ammonia (relative to the sulfonyl chloride) are in the reaction mixture? The approximate molarity of a commercial 30% ammonium hydroxide solution is 15 M
The equivalent amount of ammonia in the reaction mixture would be 0.54 relative to the sulfonyl chloride.
Stoichiometric problemThe density of 30% NH4OH solution = 0.90 g/mL
Molarity of NH4OH = 15 M
The mass of the 30% NH4OH solution in 16 ml:
mass = volume x density
mass = 16 mL x 0.90 g/mL
mass = 14.4 g
moles = mass / (molarity x molecular weight)
moles = 14.4 g / (15 M x 35.05 g/mol)
moles = 0.027 mol
The number of equivalents of NH4OH relative to the sulfonyl chloride. One equivalent of NH4OH reacts with one mole of sulfonyl chloride:
equivalents of NH4OH = moles of NH4OH / moles of sulfonyl chloride
equivalents of NH4OH = 0.027 mol / 0.05 mol
equivalents of NH4OH = 0.54 equivalents
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A student attempts to identify an unknown compound by the method used in this experiment. She finds that when she heated a sample weighing 0.5032 g the mass barely changed, dropping to 0.3176 g. When the product was converted to a chloride, the mass went up, to 0.3502 g. a. Is the sample a carbonate? b. What are the two compounds that might be in the unknown?
a. No, the sample is not carbonate. If it were a carbonate, the mass would have decreased when heated, as carbonates decompose to form carbon dioxide gas and a metal oxide when heated. Since the mass barely changed when the sample was heated, it is not carbonate.
b. The two compounds that might be in the unknown are chloride and a non-chloride compound. When the sample was converted to chloride, the mass increased, indicating that chloride was formed. However, since the mass barely changed when the sample was heated, there must also be a non-chloride compound present that did not decompose when heated.
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FILL IN THE BLANK. Most of the elements that are important in biology or low atomic mass and follow the octet rule. According to this rule, an atom is most stable when its outer or valence shell contains _____ electrons.
Most biologically significant elements have low atomic masses and adhere to the octet rule.This rule states that an atom would be most secure when it has eight electrons in its outer, or valence, shell.
What is the octet rule's foundation?0The hypothesis that main-group elements typically bind in a way that each atom gets eight electrons within its valence shell, providing it the same electrical configuration as just a noble gas, is reflected in the octet rule, a chemical rule of thumb.
What substances are permitted to defy the octet rule?Hydrogen, beryllium, and boron do not contain enough electrons to form an octet.In hydrogen, there is just one valence electron, and it has just one place where it can bond to another atom.
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What is the volume in liters of 5.50 moles of CO2 at standard
temperature and pressure (STP)?
The volume of 5.50 moles of CO2 at STP is 120.02 liters.
What is standard temperature and pressure?To calculate the volume of 5.50 moles of CO2 at standard temperature and pressure (STP), we need to use the ideal gas law:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
At STP, the pressure is 1 atmosphere (atm) and the temperature is 273.15 Kelvin (0 degrees Celsius). The gas constant is 0.08206 L•atm/mol•K.
So we can plug in the values and solve for V:
V = nRT/P = (5.50 mol)(0.08206 L•atm/mol•K)(273.15 K)/(1 atm) = 120.02 L
Therefore, the volume of 5.50 moles of CO2 at STP is 120.02 liters.
Standard temperature and pressure (STP) is a set of standard conditions used for measuring and comparing the properties of gases. STP is defined as a temperature of 273.15 Kelvin (0 degrees Celsius) and a pressure of 1 atmosphere (atm). These standard conditions allow scientists to compare the behavior of gases under the same set of conditions, making it easier to compare and contrast the properties of different gases.
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The number of moles is 123.2 moles
How can you find the volume form moles?To find the volume of a substance from its number of moles, you will need to know its molar volume, which is the volume occupied by one mole of a substance. The molar volume can vary depending on the temperature and pressure, so you will need to specify these conditions.
The formula to calculate the volume of a substance from its number of moles is:
Volume = Number of moles x Molar volume
We know that;
1 mole occupies 22.4 L
5.5 moles occupies 5.5 moles * 22.4 L/1 mole
= 123.2 moles
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what type of reaction is shown ?
can someone please help me with question 4, i don’t understand?
14 moles of iron will react with 10.5 moles of oxygen and produce 7 moles of ferric oxide (Fe2O3).
What is the complete statement?According to the balanced chemical equation:
4Fe + 3O_2 ---> 2Fe2O3
For every 4 moles of Fe, we need 3 moles of O_2 to react.
So, to determine the moles of oxygen required to react with 14 moles of iron, we can use the mole ratio from the balanced equation:
14 moles Fe x (3 moles O_2/4 moles Fe) = 10.5 moles O_2
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For the reaction of sulfur dioxide and oxygen to produce sulfur trioxide, shown below, what is the equilibrium concentration of sulfur dioxide, SO2, if the equilibrium concentrations of O2 and SO3 are 0.12 M and 0.015 M, respectively?
2 SO2(g) + O2(g) ⇄ 2 SO3(g) K = 1.5
The equilibrium concentration of sulfur dioxide, SO2, is 0.084 M.
What is equilibrium?Equilibrium is a state in which opposing forces or influences are balanced. It is a state of balance between opposing forces or actions in which the forces cancel each other. In economics, it is the state in which market supply and demand balance each other out and in which the prices of goods and services are stable. In physics, equilibrium is the state in which an object experiences no net force and its velocity is constant. In chemistry, equilibrium is the state in which the rates of the forward and reverse reactions are equal.
At equilibrium the reaction will be at its equilibrium constant value, K. This means that the concentration of SO2 can be determined by rearranging the equilibrium expression, K = [SO3]2/[SO2]2, and solving for [SO2].
[SO2] = sqrt([SO3]2/K)
[SO2] = sqrt((0.015)2/1.5)
[SO2] = 0.084 M
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(a) Write a balanced equation for the coupling reaction of bromobenzene on the metal surface to form biphenyl.
(b) Write balanced equations for the reactions of phenylmagnesium bromide and trityl fluoborate with water.
The balanced equation for the coupling reaction of bromobenzene on the metal surface to form biphenyl is mentioned below.
What is a coupling reaction?The coupling reactions are a class of chemical reactions where unification of two or more hydrocarbons coupled with the help of a metal catalyst.
(a) The balanced equation for the coupling reaction of bromobenzene on the metal surface to form biphenyl is:
2C₆H₅Br + 2Na → (C₆H₅)₂ + 2NaBr
(b) The balanced equations for the reactions of phenylmagnesium bromide and trityl fluoborate with water are:
PhMgBr + H₂O → PhH + MgBrOH
Trityl fluoborate + H₂O → Trityl alcohol + HBF₄
Therefore, the balanced equations are given above.
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match the classes of enzymes with their functions: group of answer choices catalyze cleavage of molecules driven by addition of water hydrolases catalyze transfer of functional groups within a molecule isomerases catalyze linking two molecules into a larger one ligases catalyze electron transfer reaction between two molecules oxidoreductases catalyze transfer of functional groups between different molecules
Isomerases and hydrolases, which start the bond-breaking process when water is introduced to a molecule, move functional groups inside a molecule to create isomers.
What kind of hydrolases are examples?Esterase's, such as lipases, calcium - dependent, glycosidases, peptidases, and nucleosidases, are typical examples of hydrolase enzymes. The fact that hydrolase enzymes have degradative characteristics makes them crucial for the organism.
Where in the body can you find hydrolase?The kidneys and the liver have large quantities of this enzyme, and many other human tissues also contain minor amounts of it. The amino acid tyrosine, a component of many foods' proteins, is broken down by the final of a group of five enzymes, fumarylacetoacetate hydrolase.
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During the first half of the 20th century, radium was used in various hair creams, toothpaste, and even chocolate! Radium-223 undergoes β decay with a half-life of 11.4 days. What is the activity of a sample that contains 1.00 µg of radioactive 223Ra? Express your answer in curies.
The activity of the sample containing 1.00 µg of radioactive 223Ra is 5.14 x 10^-5 curies.
How do we calculate?We will use the equation
Activity = (number of radioactive nuclei) x (decay constant)
The number of radioactive nuclei can be found using Avogadro's number, which gives the number of atoms in a mole of substance.
For 223Ra, the number of atoms in 1.00 µg (or 1.00 x 10^-6 g) is:
(1.00 x 10^-6 g) / (223 g/mol x 6.022 x 10^23 atoms/mol) = 2.69 x 10^14 atoms
The decay constant is found as:
t1/2 = 11.4 days = 9.84 x 10^5 seconds (since 1 day = 8,6400 seconds)
λ = ln(2) / t1/2 = 7.05 x 10^-9 s^-1
In conclusion, the activity of the sample is:
Activity = (2.69 x 10^14 atoms) x (7.05 x 10^-9 s^-1) = 1.90 x 10^6 Bq
When converted to curries, we have:
Activity = (1.90 x 10^6 Bq) / (3.7 x 10^10 Bq/Ci) = 5.14 x 10^-5 Ci
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What must happen for a nucleus to be stable?
OA. The strong nuclear force must balance electrostatic forces in the
nucleus.
B. The electrostatic force must be stronger than the strong nuclear
force.
OC. The number of protons must be greater than the number of
neutrons.
D. The number of neutrons must be greater than the number of m
quarks.
Neutron-to-proton ratios of at least and even numbers of protons and neutrons are characteristics of stable nuclei. It is common for particularly stable nuclei to have protons and neutrons in magic numbers.
Protons and electrons: what are they?A subatomic particle having a negative charge is an electron. A strong nuclear force keeps protons together in the nucleus of an atom. A particular subatomic particle without no charge is the neutron.
What materials make up neutrons?Neutrons are made up of one up quark and three down quarks. This "strong nuclear force," one of the four basic forces, keeps the nucleus together. Two more are gravity and electromagnetism.
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Answer:its a
Explanation: bc im just him
determine if each statement about the molecule in the reaction below is true or false. phosphoenolpyruvate is a product (click to select) mg 2 ion is a cofactor (click to select) pyruvate kinase is an enzyme (click to select) pyruvate is a substrate (click to select)
Phosphoenolpyruvate is a substrate (false), Mg2+ ion is a cofactor (true), pyruvate kinase is an enzyme (true), pyruvate is a product (true).
What is Ion?
An ion is an atom or molecule that has a non-zero net electrical charge due to the loss or gain of one or more electrons. If an atom loses electrons, it becomes a positively charged ion, known as a cation, whereas if it gains electrons, it becomes a negatively charged ion, known as an anion. Ions play important roles in many chemical and biological processes, such as in the conduction of electricity in nerves and muscles, the regulation of pH in blood, and the formation of chemical bonds.
"Phosphoenolpyruvate is a product" - This statement is false. Phosphoenolpyruvate is a substrate, meaning it is the starting molecule that undergoes a chemical reaction to produce a product, which in this case is pyruvate.
This statement is true. Mg2+ ion is a cofactor required for the activity of pyruvate kinase enzyme. It acts as a cofactor by binding to the enzyme and playing a key role in catalyzing the chemical reaction.
This statement is true. Pyruvate kinase is an enzyme that catalyzes the transfer of a phosphate group from phosphoenolpyruvate to ADP, resulting in the formation of pyruvate and ATP.
"Pyruvate is a substrate" - This statement is true. Pyruvate is the product formed by the chemical reaction between phosphoenolpyruvate and pyruvate kinase enzyme.
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A chemist prepares a solution of sodium chloride (NaCI) by measuring out 68. umol of sodium chloride into a 200. mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in mmol/L of the chemist's sodium chloride solution. Be sure your answer has the correct number of significant digits.
Answer:
the concentration of the sodium chloride solution is 0.34 mmol/L, rounded to two significant digits.
Explanation:
To calculate the concentration of the sodium chloride solution, we first need to convert the amount of NaCl from micromoles (umol) to moles (mol) using the following conversion factor:
1 umol = 1 × 10^-6 mol
So, 68. umol of NaCl is equal to:
umol x (1 mol / 1 × 10^6 umol) = 6.8 × 10^-5 mol
Next, we can use the formula for molarity to calculate the concentration of the solution:
Molarity = moles of solute / volume of solution in liters
The volume of the solution is given as 200. mL, or 0.200 L. Substituting the values we have calculated, we get:
Molarity = 6.8 × 10^-5 mol / 0.200 L = 0.00034 mol/L
Finally, we can convert the concentration from mol/L to mmol/L by multiplying by 1000:
0.00034 mol/L x 1000 mmol/mol = 0.34 mmol/L
Part 2 The student wanted to know if the value obtained from their experiment (part 1) is similar to that calculated using average bond enthalpy data.
a) Using the balanced equation and the data in the table below, calculate the theoretical enthalpy of combustion.
Note: you will need to include the enthalpy of vaporisation for the liquid components which are also given.
C₂H5OH()+302(g) → 2CO2(g) + 3H₂O(1)
Average Bond Enthalpies (kJ mol-¹)
C-H 412
C-C 348
C-O 358
O=O 496
C=O 743
O-H 463
Enthalpy of Vaporisation (kJ mol-¹)
Ethanol 42.5
Water 41
-1113.5kJ is the theoretical enthalpy of combustion.
What makes energy different from enthalpy?
The entire amount of heat energy that is either absorbed or released in a thermodynamic system is measured by enthalpy. Internal energy denotes all of the potential or moving energy present in a thermodynamic system.
Enthalpy of combustion is the term used to describe the change in a system's enthalpy that occurs when one mole of a substance fully burns in oxygen or air at a specific temperature.
C₂H5OH()+302(g) → 2CO2(g) + 3H₂O(1)
Reactants:
5 C-H : 5*412
1 C-C : 348
1 C-O: 358
3 O=O: 3* 496
1 O-H: 463
Products:
2*2 C=O : 4*743
2*3 O-H: 6*463
Enthalpy of Vaporization (kJ mol-¹) for :
Ethanol 42.5
Water 41
Enthalpy of combustion : (5*412 + 348 + 358 + 3* 496 + 463 + 42.5) - ( 3*41 + 4*743 + 6*463)
: -1113.5kJ
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When sodium (na) and chlorine (cl) are combined, a small amount of table salt is formed and a bright yellow light and a lot of heat are given off. Does it take more energy to break the bonds of the reactants, or is more energy released when forming the bonds of the products? how do you know?(1 point).
Since a lot of heat is produced during the bond- forming process of the products, further energy is released during that process than is frequently the case.
A more accurate dimension of energy use and position is thermal energy. As bonds are broken in the reactants during exothermic processes, further energy is released when the bonds are created in the products. An increase in the response admixture's temperature is a specific of exothermic responses. The term" endothermic" refers to chemical responses that generally absorb( or use) energy. When bonds in the reactants are broken, further energy is absorbed than is released when new bonds are generated in the products. This is known as an endothermic response. As the response's temperature drops, endothermic processes are endothermic.
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It takes more energy to break the bonds of the reactants than to form the bonds of the products. This is because of the Law of Conservation of Energy,
Which states that energy cannot be created or destroyed, only transferred from one form to another. When the reactants undergo a chemical reaction, the bonds between the atoms break and the energy that was stored in those bonds is released in the form of heat and light. This energy is then used to form the bonds between the atoms of the products. This process requires less energy than the breaking of the bonds of the reactants, so overall more energy is released than was used to break the bonds.
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PLEASE HELP!!! how do i do this, i don’t understand how to do these
Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
QUESTION 5:
According to question 5, 4 moles of iron reacts with 3 moles of oxygen gas to produce 2 moles of ferric oxide.
56.33 grams of iron is equivalent to 1.01 moles
This means that 1.01 moles of iron will produce 0.51 moles of ferric oxide.
Mass of ferric oxide = 0.51 × 159.69 = 80.6 grams.
QUESTION 6:
According to question 6, 3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia.
13.55 grams of hydrogen is equivalent to 6.78 moles
This means that 6.78 moles of hydrogen will produce 4.52 moles of ammonia
Mass of ammonia = 4.52 × 17 = 76.8 grams.
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