Taking into account the reaction stoichiometry, the percent yield of BaCO₃ is 81.07%.
Reaction stoichiometryIn first place, the balanced reaction is:
BaCl₂ + Na₂CO₃ → BaCO₃ + 2 NaCl
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
BaCl₂: 1 moleNa₂CO₃: 1 moleBaCO₃: 1 moleNaCl: 2 molesDefinition of molarityMolarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by:
molarity= number of moles÷ volume
Amount of reagent in this caseIn first place, you know:
Molarity of BaCl₂= 0.500 MNumber of moles of BaCl₂= ?Volume of BaCl₂= 25 mL= 0.025 L (being 1000 mL= 1 L)Molarity of Na₂CO₃= 0.500 MNumber of moles of Na₂CO₃= ?Volume of Na₂CO₃= 25 mL= 0.025 L (being 1000 mL= 1 L)Replacing in the definition of molarity:
0.500 M= number of moles of Na₂CO₃÷ 0.025 L
Solving:
number of moles of Na₂CO₃= 0.500 M× 0.025 L
number of moles of Na₂CO₃= 0.0125 moles
0.500 M= number of moles of BaCl₂÷ 0.025 L
Solving:
number of moles of BaCl₂= 0.500 M× 0.025 L
number of moles of BaCl₂= 0.0125 moles
This indicates that 0.0125 mol of Na₂CO₃ and 0.0125 mol of BaCl₂ are present.
Since the stoichiometric ratio of the reactants is 1:1, if 0.0125 mol of Na₂CO₃ and BaCl₂ are present, since the amounts are equal, it makes no difference to work with any of the reactants.
Percent yield
The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
percent yield= (actual yield÷ theoretical yield)×100%
where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.
Theoretical yield of BaCO₃The following rule of three can be applied: if by reaction stoichiometry 1 mole of BaCl₂ form 1 mole of BaCO₃, 0.0125 moles of BaCl₂ form how many moles of BaCO₃?
moles of BaCO₃= (0.0125 moles of BaCl₂×1 mole of BaCO₃)÷ 1 mole of BaCl₂
moles of BaCO₃= 0.0125 moles
Being the molar mass of BaCO₃ 197.35 g/mole, the theoretical yield of BaCO₃ is calculated as:
theoretical yield of BaCO₃= 0.0125 moles× 197.35 g/mole
theoretical yield of BaCO₃= 2.466875 grams
Percent yield for the reaction in this caseIn this case, you know:
actual yield= 2 gramstheorical yield= 2.466875 gramsReplacing in the definition of percent yield:
percent yield= (2 grams÷ 2.466875 grams)× 100 %
Solving:
percent yield= 81.07%
Finally, the percent yield for the reaction is 81.07%.
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When a tablet is dropped into water, the tablet releases tiny bubbles that make a fizzing noise. Gradually the tablet disappears into the water, which becomes cloudy. Did substances in the tablet enter a chemical reaction with the water?
The tablets must be completely dissolved in water before use, where they notably cause a chemical reaction that results in a large amount of carbon dioxide bubbles, or fizz.
Why is that so? The sodium bicarbonate breaks into sodium and bicarbonate ions as the tablets break down. Carbon dioxide gas is created when the bicarbonate ions interact with the hydrogen ions in citric acid (and water). The bubbles are created in this manner. In school, you might probably tried an experiment where you mixed baking soda with vinegar to see it foam. That's what happening in baking powder.If you look at ingredients for Alka-Seltzer, you will find that it contains citric acid and sodium bicarbonate (baking soda).
When you drop the tablet in the water, the acid and the baking soda react -- this produces the fizz.
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For the dissolution of HCl in water represented above, which of the following pairs includes the Brønsted-Lowry bases?HCl(aq)+H2O(l)→H3O+(aq)+Cl−(aq)
According to Lowry-Bronsted concept, for dissolution of HCl in water , H₂O acts as a Lowry-Bronsted base as it accepts proton from HCl.
What is Lowry-Bronsted concept?According to Lowry-Bronsted concept, acid can be defined as a substance which donates a proton and forms its conjugate base while base is a substance which accepts a proton and forms its conjugate acid.
Conjugate base which is formed from acid accepts a proton and acid is reformed, while conjugate acid which is generated from base donates a proton and base is regenerated.
The theory involves the transfer of protons between an acid and a base.They are also classified depending on their ability to donate and accept protons .Strong Lowry-Bronsted acid and bases are those which loose and accept protons easily while weak Lowry-Bronsted acids and bases are those which do not loose and accept protons readily.
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the absorbance of the solution at 427 nm is 0.15 . if the molar absorptivity of yellow dye at 427 nm is 27400 m–1cm–1, what is the concentration of the solution in m?
The concentration of the solution if the absorbance of the solution at 427 nm is 0.15 and the molar absorptivity of yellow dye at 427 nm is 5.47 × 10-⁶M.
How to calculate concentration?Absorbance in physics is a logarithmic measure of the amount of light that is absorbed when passing through a substance.
It is the capacity of a substance to absorb light of a given wavelength. According to this question, the absorbance of the solution at 427 nm is 0.15.
A = εmCl
Where;
A = absorbanceεm = molar extinction coefficientC = concentrationl = path length of 1 cmC = 0.15 ÷ (27400 × 1)
C = 5.47 × 10-⁶M
Therefore, 5.47 × 10-⁶M is the concentration of the solution.
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Find the percent by mass of each element in C12H22O11
STEP 1:
C 12 x 12.01 =
H 22 x 1.00 =
O 11 x 15.99 =
Molar Mass =
The percent by mass of each element in C12H22O11 is 42.1 % for C, 6.4 % for H, and 51.43 % for O respectively.
The mass consistent with cent is defined as the grams of solute consistent with grams of solution, accelerated with the aid of one hundred to get the share. The Mass in keeping with cent components is expressed as fixing for the molar mass and also for the mass of each detail in 1 mole of the compound. Mass percent is one way of representing the attention of an element in a compound or a component in a mixture
Calculation:-
Molar Mass of C12H22O11 = 342
C 12 x 12.01 = 144.12 / 342 × 100
= 42.1 %
H 22 x 1.00 = 22/ 342 × 100 = 6.4 %
O 11 x 15.99 = 175.89/ 342 × 100 = 51.43 %
Mass percentage composition is likewise recognized percent via weight. it's miles abbreviated as w/w%. For a solution, mass percent equals the mass of an element in a single mole of the compound divided with the aid of the molar mass of the compound, increased with the aid of 100%.
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The oxidation number of the chlorine (Cl) in extraction of bromine from sea water is -1, oxidation number of sodium is +1 and the oxidation number of bromine is -1.
Bromine is obtained from sea water by oxidizing the ionic state of bromine Br⁻ into Br₂, Br₂ is easily hydrolyzed. In order to prevent hydrolysis it is important to lower the pH of the solution which is done by increasing the level of H⁺ ions in the solution.
The balanced chemical reaction for extraction of bromine from sea water is given as:
Cl₂ (g) + 2 NaBr (aq) → 2 NaCl (g) + Br₂ (l)
Hence, from the above equation oxidation numbers of chlorine, bromine and sodium are -1, -1 and +1 respectively.
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The nitrogen diabetic molecule contains a triple bond. which type of bond(s) does this molecule contain? Please help I’ll mark brainliest! Thank you :)
THE ANSWER IS NOT C.
One sigma and two pi bonds make up the triple bond in the diatomic molecule of nitrogen.
What do you call a triple bonded nitrogen?As with all molecules, molecular nitrogen is made up of two nitrogen atoms triple bonded to one another. As with all molecules, this triple bonding allows the outer electron shells of the two nitrogen atoms to fill up, making the molecule more stable than the individual nitrogen atoms.
With another nitrogen atom, three of them form a triple bond (which also has five electrons in its outermost shell). Because of this, a nitrogen molecule has a triple bond between two nitrogen atoms and a lone pair on each nitrogen atom.
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what is the maximum amount of KNO3 that can be dissolved in 100 g of 50 C water ? A. 15g B. 36g C. 84g D. 100g
From the solubility curve, it is clear that 84 g of potassium nitrate can be dissolved in 100 g of water at 50°C.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible.
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How would you prepare pentanal from the following starting materials?
(a) CH₃CH₂CH₂CH₂CH₂OH
b) CH₃CH₂CH₂CH₂CH=CH₂
(c) CH₃CH₂CH₂CH₂CO₂CH₃
(d) CH₃CH₂CH₂CH=CH₂
A) Pentanal aldehyde can be prepared from CH₃CH₂CH₂CH₂CH₂OH by the oxidation with PCC.
B) Pentanal can be prepared from CH₃CH₂CH₂CH₂CH=CH₂ by ozonolysis with the help of O₃ /Zn.
C) Pentanal can be prepared from ester CH₃CH₂CH₂CH₂CO₂CH₃ by hydrolysis and then reduction with LiAlH₄.
D) Pentanal can be prepared from CH₃CH₂CH₂CH=CH₂ by using BH₃/H₂O/NaOH followed by PCC.
What is Pentanal?Pentanal or valeraldehyde can be described as an organic compound an alkyl aldehyde, with molecular formula C₅H₁₀O. Pentanal can be used in flavorings, rubber accelerators, and resin chemistry. The smell of Pentanal is described as fermented, bready, fruity, nutty, and berry.
Pentanal can be obtained by hydroformylation of butene and can be used as starting material such as the so-called raffinate II, which is formed by steam cracking and consists of (Z)- and (E)-2-butene, 1-butene, butane, and isobutane.
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Some people are concerned about the use of nanoparticles. Evidence has suggested that nanoparticles can get through the skin and into the blood. Describe a method scientists could use to find out whether nanoparticles can get into the blood and cause health problems. In your method, including how you should make sure the investigation is fair. In this question, you get marks for how well your answer is written
The presence of nano particles in the blood can be confirmed by the use of atomic absorption spectroscopy.
What are nano particles?
We define a nano particle as a particle that has a size that is less than 100 nm. These kinds of particle have found a very wide application especially in the materials industry. A lot of the chips that we see are actually made of nano particles.
More recently, there have been the application of the nano particles in medicine. We have been told that evidence has suggested that nanoparticles can get through the skin and into the blood.
If a scientist wants to investigate this claim, then the scientist would have to take blood samples from individuals who have been exposed to the nano particles at random and expose the samples to atomic absorption spectroscopy to determine if there are traces of the particles in the blood.
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How much heat is released when 100.0 grams of steam condenses at 100.0º C?
The amount of heat released when 100.0 grams of steam condenses to water at 100.0º C is 224000 J.
What is the amount of heat released when 100.0 grams of steam condenses to water at 100.0º C?The amount of heat released when 100.0 grams of steam condenses to water at 100.0º C is calculated from the formula given below:
Amount of heat = mass * latent heat of vaporization of water
The latent heat of vaporization of water is the amount of heat required to convert a unit mass of water to steam at100 0.0º C or vice versa.
The latent heat of vaporization of water is 2240 J/g
mass of steam = 100.0 g
Amount of heat required = 100.0 g * 2240 J/g
Amount of heat required = 224000 J
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Under what conditions is n2o3 No gas + n02 gas
spontaneous?
The reaction is spontaneous under conditions of low pressure and high temperature
What is a spontaneous reaction?We can say that a reaction is spontaneous when we know that the reaction is able to go on on its own. This implies that there is a mnimum energy that is required for the reaction to proceed.
The reaction is thus a sort of a self propagating system that goes on freely of its own accord.. We can see that what is going on here is the decomposition of the nitrogen V oxide gas as shown.
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Use the periodic table to answer the following questions. The person done fastest with the most correct answers will win a prize on Thursday. You may use your notes, but not a partner.
1. How many groups are on the periodic table?
2. What element is in period 4, group 12?
3. What type of element is Hafnium?
4. What period is Uranium in?
5. What are group 1 elements called?
6. What element has 50 protons in its nucleus?
7. How many electrons can period 2 elements hold in their outer shell?
8. What are elements 89-103 called?
9. How many outer/valence electrons are in group 17 elements?
10. How many neutrons are in the most common version of Krypton?
11. What period and group is Gold in?
12. What is the third element in group 18?
13. What type of element is Germanium?
14. What group is Chlorine in? What is the group name?
15. What element is group 12, period 7?
16. How many valence/outer electrons are in Barium?
17. How many electron shells/levels/orbits/rings does Xenon use?
18. What type of element is Oxygen?
19. What element has 16 protons?
20. Which group of elements has 3 valence/outer electrons?
21. What type of element is Calcium?
22. What is the name for the elements in groups 3-12?
23. How many neutrons in the most common version of Platinum?
24. What is the 11th element in period 4?
25. What type of element is Tellurium?
26. How many protons in Tungsten?
27. What is the symbol for Tin?
28. What are the group 2 elements called?
29. How many electrons can fit in the outside shell/ring/level for period 4 elements?
30. How many neutrons are in the most common version of Lead?
There will be 18 groups in periodic table and hafnium is a kind of transition element.
Groups were the names given to the periodic table's columns. In the table, individuals who belong to the same group make bonds of the same kind and contain an equal quantity of electrons in respective molecules' outermost shells. Periods contain the horizontal rows.
1. 18 group 2. Zinc 3. Transition element 4. 7th period
5. Hydrogen, lithium sodium, potassium, rubidium, cesium and francium.
6. Tin(Sn) 7. The eight electron 8. Actinides 9. 7 valence electron
10. 47 neutron 11. 6th period and 11th group 12. Argon 13. Metalloid
14. Halogen located in 17th group 15. Copernicium 16. 2 electron 17. 5 shells 18. Non metal 19. Sulphur 20. 13 group 21. Metal 22. D or transition 23. 117 24. Copper 25. Submetallic 26. 74 27. Sn 28. Alkaline earth metal 29. 18 element 30. 125
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The reaction of siderite with perchloric acid is FeCO3 + HClO4 = Fe(ClO4)2 + CO2 + H2O.
Siderite, additionally called chalybite, iron carbonate (FeCO3), is a large mineral that is an ore of iron. The mineral normally happens in thin beds with shales, clay, or coal seams (as sedimentary deposits) and in hydrothermal metal veins (as gangue, or waste rock.
Siderite is a mineral composed of iron(II) carbonate. It takes its name from the Greek phrase σίδηρος sides, "iron". it's by far a valuable iron mineral because it is forty eight% iron and includes no sulfur or phosphorus.
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The graph shows the altitude and temperature for different layers of Earth’s atmosphere. Based on the diagram, which of the following identifies a characteristic of the atmosphere between the stratopause and the tropopause?
answer choices
Cloud formation occurs in the stratosphere.
The warmest air is found in the mesosphere.
The ozone layer is in the stratosphere.
The troposphere is the closest layer to the sun.
The ozone layer is present in the stratosphere layer of the Earth's atmosphere. Therefore, option (C) is correct.
What is the atmosphere?An atmosphere can be defined as layers of gases that envelop a planet and is held in place due to the gravity of the planetary body. A planet contains an atmosphere when the gravity is great and the temperature of the atmosphere of any planet is low.
Earth's atmosphere is made of Nitrogen (78 %), Oxygen (21%), Argon (0.9%), and Carbon dioxide (0.04 %). The troposphere can be defined as the lowest layer of the atmosphere. The troposphere contains 75 to 80 % of the mass of the atmosphere.
The stratosphere contains the ozone layer, at an altitude between 15km and 35km. This atmospheric layer absorbs most of the UV radiation that Earth receives from the Sun.
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Easy | Grade 8 practice sheet "Vocabulary of Chemical Equations"
Based on how chemical equations are written, the given chemical reaction: Four atoms of aluminum metal react quickly with 3 molecules of oxygen in the air to produce 2 molecules of aluminum oxide can be written as follows:
Word equation: Aluminum metal + oxygen gas ---> Aluminum oxide
Reactants: Aluminum metal and oxygen gas
Products: Aluminum oxide
Known states of matter: solid + gas ---> solid
Equation: 4 Al (s) + 3 O₂ (g) ---> 2 Al₂O₃ (s)
What is a chemical reaction?A chemical reaction is a type of change that results in changes in the chemical properties of substances.
Chemical reactions involve the rearrangement of atoms of substances and result in the formation of new substances.
Chemical reactions can be represented by a chemical equation.
Chemical equations use symbols to represent the reactants and the products of a reaction.
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So the electron configuration for phosphorus is 1s2 2s2 2p6 3s2 3p3, That leaves it with 3 unpaired electrons. I've came to the conclusion it's paramagnetic, but research has me questioning it. I'm seeing everywhere that it's diamagnetic. Why?
Phosphorous forms compounds in +3 or +5 oxidation state, leaving an electronic configuration as 1s² 2s² 2p⁶ 3s² in case of +3 and in case of+5 it is 1s² 2s² 2p⁶,as in these configurations all electrons are paired so phosphorous becomes diamagnetic .
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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The balanced equation is (NH₄)₂Se + 3HCL = 3NH₄Cl + H₂Se - displacement reaction.
A chemical equation is the symbolic representation of a chemical reaction within the shape of symbols and chemical formulas. A balanced chemical equation is an equation in which the quantity of atoms of each type within the reaction is the same on each reactant and product aspect. The mass, as well as the trade, are equal in a balanced chemical equation.
The worldwide stability equations (additionally referred to as full balance equations) are fixed equations that characterize the equilibrium distribution (or any desk-bound distribution) of a Markov chain, whilst any such distribution exists.
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When making lemonade, you accidentally use twice as much lemonade powder as the directions call for. No matter how much you stir, you cannot get all the powder to dissolve. What is true of the solution you made?
It is a colloid.
It is saturated.
It is an emulsion.
It is supersaturated.
Answer: colloid
Explanation:
How many grams are in 1.25 moles of NaCl
Answer:
73.05g
Explanation:
1.25 mol NaCl * [tex]\frac{58.44g}{1 mol NaCl}[/tex] = 73.05g
58.44g = molar mass of NaCl
Which model is better and why? please help me ASAp
Considering the given models of carbon dioxide and water, the most that better shows the compounds is Javier's model since it clearly shows the component elements using the correct scale.
I did not choose the other model and its scale because they do not show differences in the size of the atoms nor the atoms in the compounds clearly.
What are models?Models are diagrams, objects., illustrations, or analogies that are used to describe or explain a given phenomenon or process that occurs in nature.
Models are used by scientists to illustrate atoms, elements, or compounds since they are not readily visible to the eyes.
A good model will give a correct description of what they represent.
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What is neutron ?....
Answer:
A neutron is a subatomic particle found in the nucleus of every atom except that of simple hydrogen.
Explanation:
Answer:
With the exception of simple hydrogen, every atom has a neutron in its nucleus. The fact that the particle has no electrical charge it is neutral gives it its name. Neutrons have a very high density.
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Steam is compressed from 6 MPa and 300C to 10 MPa isentropically. The final temperature of the steam is
(a) 290∘C
(b) 300∘C
(c) 311∘C
(d) 371∘C
The final temperature of the steam at 10MPa is equal to 390 °C.
What is Gay Lussac's law?Gay-Lussac's law can be described as if the volume (V) of the gas remains constant the pressure (P) is directly proportional to the absolute temperature (T) of the gas.
Gay Lussca's law in the form of mathematical expression as follows:
P/T = k
The pressure at constant volume is directly proportional to the temperature of gas.
P ∝ T (where V of gas is constant)
or, [tex]{\displaystyle \frac{T_2}{T_1} =\big (\frac{P_2}{P_1}\big)^\frac{\gamma-1}{\gamma}[/tex] for isentropic compression
Given, the initial temperature of the steam, T₁ = 300°C =300 + 273 =573 K
The initial pressure of the steam, P₁ = 6 MPa
The final temperature of the steam, P₂ = 10MPa
The final temperature of the steam can be determined as:
[tex]{\displaystyle \frac{T_2}{573} =\big (\frac{10}{6}\big)^\frac{1.4-1}{1.4}[/tex]
T₂ = 663 K
T₂ = 663 K - 273 K
T₂ = 390 °C
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A constant electric current deposited 365 mg of Ag in 216 minutes from an aqueous Silver trioxonitrate (v). What is the Current?
The electric current is 0.025 A
Electric current refers back to the go with the flow of energy in an electronic circuit and to the amount of strength flowing through a circuit. it's far measured in amperes (A). the bigger the cost in amperes, the more energy is flowing within the circuit.
Ag+ + e¯ →Ag
1F deposits 107.87 g/mol (molecular mass) of silver
1F = 96500 C
Let, 107.87 g/mol needed = 96500 C
Number of coulombs required to deposit 0.3650 g of silver =(96500/107.87) 0.3650
Q = 326.5 C
According to Faraday’s law, Q = I x t
I = 326.5 C / (216 x 60 s) = 0.025 A
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Witch hazel solution, an astringent for skin,
contains 14% ethyl alcohol, C₂H5OH, by volume.
How many mL of ethyl alcohol are contained in a
16 fluid ounce bottle of witch hazel?
16 fluid ounce bottle of witch hazel will have 66.24ml of ethyl alcohol.
What is volume percentage?volume percent of a solution is the ratio of the volume of a solute present in a solution to the volume of the solution as a whole.
Volume Percent = V solute(mL)/V solution(mL) × 100
Volume Percent = V solute(mL)/V solute(mL)+V solvent(mL) × 100
14% of 16 fluid ounce
=(14/100)×16
=0.14×16
=2.24 fluid ounce
=66.24ml
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Give the formula of Plaster of Paris And some of its uses..
:))
how many total electron pairs are in the structure of c s 2
The total number of the electron pairs are eight electron pairs.
What are electron pairs?We know that the structure of a compound can be determined by the number of the electron pairs that are found on the valence shell of the central atom of the compound.
We know that the central atom must be the atom that is least electronegative. Given that there are four valence electrons of carbon which is the central atom in the compound, we have eight electron pairs in the molecule. Thus the total number of valence electrons present is sixteen
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Question 8
A certain cation has five atoms and an overall charge of +1. Which of the following combinations of
formal charges on the five atoms is indicative of the "best" Lewis structure?
Answer:
0, 0, 0, +1, 0
Explanation:
Because the compound has a +1 charge overall, the sum of the formal charges must equal +1. The correct answer is the Lewis structure with as many atoms as possible having the formal charge of 0 with just a single atoms having the +1 formal charge.
which of the following lewis diagrams best represents the bonding in the N2O molecule, considering formal charges? justify your answer.
Considering the formal charges, the lewis structure in which the electronegative atom (O) contains a negative charge and the electropositive (N) contains a positive charge represents bonding in the N₂O. Therefore, option (B) is correct.
What are the formal charges?A formal charge in chemical bonding can be described as the charge assigned to an atom in a molecule by considering that electrons in all chemical bonds are equally shared between atoms, regardless of relative electronegativity.
The formal charge can be described as the difference between the number of valence electrons of an atom in a neutral state and the number assigned in a Lewis structure to that atom.
When determining the best Lewis structure for a molecule, the structure is selected such that the formal charge is as close to zero on each atom.
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A 1.90 g sample of elemental sodium, Na(s) is reacted with water, yielding sodium
hydroxide, NaOH, and hydrogen. 2Na(s) + 2H2O(l)→ 2NaOH(aq) + H2(g); The H2(g) is collected
over water at 18 oC. What are the partial pressures of the two gases (hydrogen and water
vapor) when contained in a 1.00 l container at 25
oC? What is the total pressure?
The partial pressure of hydrogen is 0.98 atm while the partial pressure of water is 0.02 atm. The total pressure of the system is 1 atm.
What is the pressure?We have seen the reaction as it has been shown in the equation that is attached to the question above. Now, we must have to find the number of moles of the hydrogen that was obtained.
Number of moles of sodium = 1.90 g/23 g/mol = 0.08 moles
2 moles of sodium produces 1 mole of hydrogen
0.08 moles of sodium would produce 0.08 moles * 1 mole/ 2 moles
= 0.04 moles
Given that;
P = pressure
V = volume
n = Number of moles
R = gas constant
T = temperature
PV = nRT
P = nRT/V
P = 0.04 * 0.082 * 298/1
P = 0.98 atm
The partial pressure of the hydrogen = 0.98 atm
The partial pressure of the water = SVP of water at 18°C = 0.02 atm
Total pressure of the system = 0.98 atm + 0.02 atm = 1 atm
The system has a total pressure of 1 atm.
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A 23.6 -L sample of nitrogen at 4.45 atm and 23°C is simultaneously expanded to 50.8 L and heated to 37°C. What is the new pressure of the gas?
282 atm
0.0767 atm
2.17 atm
1.36 x 10-9 atm
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Combined Boyle's and Charles' gas law is used here. Therefore the new pressure of nitrogen gas is 2.18 atm when the temperature is changed to 310K and volume is expanded to 50.8 L.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
Combining Boyle's and Charles' gas law
P₁V₁/T₁ = P₂V₂/T₂
{ ( 4.45) ( 23.6)} ÷296K ={ (P2) (50.8 )} ÷310
P2 =0.35÷0.16 = 2.18 atm
Therefore the new pressure of nitrogen gas is 2.18 atm when the temperature is changed to 310K and volume is expanded to 50.8 L.
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