In every 100g of that compund there is 50.84 g of C, 8.53 g H and (100-59.37) g = 40.63 g of O.
Step 1: Convert each element's mass in moles. To do that we need to divide each element's mass by their respective molar mass.
For Carbon.
[tex]C = \frac{50.84}{12} = 4.24 mol [/tex]
For Hydrogen.
[tex]H = \frac{8.53}{1} = 8.53 mol [/tex]
For Oxygen.
[tex]O = \frac{40.63}{16} = 2.54 mol [/tex]
Step 2: Divide each of the numbers by the smallest number.
For Carbon.
[tex]C = \frac{4.24}{2.54} = 1.7 [/tex]
For Hydrogen.
[tex]H = \frac{8.53}{2.54} = 3.36 [/tex]
For Oxygen.
[tex]O = \frac{2.54}{2.54} = 1 [/tex]
Step 3: So the empirical formula will be.
[tex] C_{1.7} H_{3.36} O_1 [/tex]
But using decimal will be messy. So we multiply the numbers by 3. The right empirical formula will be.
[tex] C_{5} H_{10} O_3 [/tex]
The empirical formula of an organic compound that contains 50.84% C, 8.53% H, and the rest oxygen is C₅H₁₀O₃.
First, we have to determine the mass percentage of oxygen, knowing that C, H and O amount to the 100% of the compound.
[tex]C + H + O = 100\%\\O = 100\% - C - H\\O = 100\% - 50.84\% - 8.53\% = 40.63\%[/tex]
Then, we divide each mass percentage by the atomic mass of the element.
[tex]C: 50.84/12.01 = 4.23\\H: 8.53/1.01 = 8.45\\O: 40.63/16.00 = 2.54[/tex]
Afterwards, we divide all the numbers by the smallest one, i.e. 2.54.
[tex]C: 4.23/2.54 = 1.66\\H: 8.45/2.54 = 3.33\\O: 2.54/2.54 = 1[/tex]
Finally, we multiply all the numbers by 3, so that they are all integers.
[tex]C: 1.66 \times 3 \approx 5\\H: 3.33 \times 3 \approx 10\\O: 1 \times 3 = 3[/tex]
The empirical formula of the organic compound is C₅H₁₀O₃.
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AP Chemistry
25.5 g of methane burns in the combustion reaction below. How much water is produced in this reaction? CH4 + 202 -- CO2 + 2H20
A. 22.69
B. 57.39
C. 510g
D. 3.18 9
Answer:
B
Explanation:
CH4 + 2 O2 → CO2 + 2 H20
12 + I X 4 → → 2 ( I X2 + 16 )
16 → → 36
25, 5 → → ?
amount of H2O = 36 X 25,5 / 16 = 57. 39
One mole or 16 g of methane gas reacts with excess oxygen to give 2 moles or 36 g of water. Then, the mass of water produced from 25.5 g of methane is 57.3 g.
What is combustion?Combustion is the reaction of a gas with the atmospheric oxygen producing water and carbon dioxide. The hydrocarbon gases such as methane, ethane etc easily undergo combustion reaction.
As per the given balanced reaction, one mole of methane gas CH4 produces two moles of water.
molar mass of methane = 16 g/mol
molar mass of water = 18 g/mol
mass of 2 moles of water = 36 g.
Hence, 16 g methane gas produce 36 g of water.
The mass of water produced from 25.5 grams of methane gas is then calculated as follows:
mass of water = 25.5 × 36 / 16 = 57.3 g.
Therefore, 57.3 g of water is produced in this reaction from 25.5 g of methane.
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Need help on chemistry
Answer:
B
Explanation:
Protons are located in the nucleus, which takes out c
Electrons are in specific shells, so b is the answer
At 25 °C, what is the hydroxide ion concentration, [OH-], in an aqueous solution with a hydrogen ion concentration of
[H+1=4.1 x 10-5 M?
[OH) =
M
The hydroxide ion concentration, [OH-] = 2.439 x 10⁻¹⁰
Further explanationEquilibrium of water and the ions :
[tex]\tt 2H_2O(l)\rightarrow H_3O^+(aq)+OH^-(aq)[/tex]
[tex]\tt Kc=\dfrac{[H_3O^+][OH^-]}{H_2O}[/tex]
Kc[H₂O] is the ion equilibrium constant for water ⇒ Kw.
The product of the concentrations of these ions (H₃O⁺ and OH⁻)at equilibrium at 25°C is 1.0 x 10⁻¹⁴ M
[H₃O⁺] [OH⁻] = 1.0 x 10⁻¹⁴ M = Kw
The hydrogen ion concentration of [H⁺]=4.1 x 10⁻⁵ M, so the hydroxide ion concentration, [OH-] :
[tex]\tt 4.1\times 10^{-5}\times [OH^-]=1.10^{-14}\\\\(OH^-]=\dfrac{1.10^{-14}}{4.1\times 10^{-5}}\\\\(OH^-]=2.439\times 10^{-10}[/tex]
I need help and fast plzzzzzzzzz
Answer:
A is condensation
B is Conduction
C is erosion
D is radiation
E is deposition
Explanation:
write 4 important of measurement?
Answer:
Measurement helps in buying and selling goods
Measurement helps in doing various science
experiment
Measurement is used in our daily life
Measurement is essential for making roads, bridge etc
The isotope 238U, which starts one of the natural radioactive series, decays first by alpha decay followed by two negative beta decays. At this point, what is the resulting isotope
Answer: The resulting isotope is [tex]^{231}_{92}\textrm {U}[/tex]
Explanation:
Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.
[tex]^{235}_{92}\textrm{U} \rightarrow ^{231}_{90}\textrm {Th}+^{4}_{2}n[/tex]
Beta Decay : It is a type of decay process, in which a proton gets converted to neutron and an electron. This is also known as -decay. In this the mass number remains same but the atomic number is increased by 1.
[tex]^{231}_{90}\textrm{Th}\rightarrow ^{231}_{92}\textrm {Th}+2^{0}_{-1}n[/tex]
The resulting isotope is [tex]^{231}_{92}\textrm {U}[/tex]
Question 21 of 25
What is the oxidation state of Cl in HCIO4?
O A. +7
OB. -3
O c. -1
D. +8
Answer:
7
Explanation:
Ren runs a hamburger stand and needs to clean up a season’s worth of grease buildup on the range hood over his griddle. Explain what he should look for in a cleaning product that can handle a layer of grease.
Answer:
A simple mix of baking soda, kosher salt, and dish soap
Explanation:
I don't know why you would need to know this but the stuff mentioned above should get rid of the grease
Answer:
Sample Response for Edge2021: Ren should use a cleaning product that contains a base. This is because bases readily react with lipids, the kind of compound that makes up grease. A base would break down the grease, forming soap, which would then easily wash away.
Explanation:
The diameter of a helium atom is about 1 3 102 pm. Suppose that we could line up helium atoms side by side in contact with one another. Approximately how many atoms would it take to make the distance from end to end 1 cm
Answer:
1 × 10⁸ He atoms
Explanation:
Step 1: Given data
Diameter of a helium atom (d): 1 × 10² pmTotal distance to be covered (D): 1 cmStep 2: Convert "d" to meters
We will use the conversion factor 1 m = 10¹² pm.
1 × 10² pm × (1 m / 10¹² pm) = 1 × 10⁻¹⁰ m
Step 3: Convert "D" to meters
We will use the conversion factor 1 m = 100 cm.
1 cm × (1 m / 100 cm) = 0.01 m
Step 4: Calculate the number of atoms of He required
We will use the following expression.
D/d = 0.01 m / 1 × 10⁻¹⁰ m = 1 × 10⁸
Please help me this is a big grade please
Answer:
water
Explanation:
because the others are in compounds and can not be considered as products lonely.
Whats the difference between an atom and an ion?
An atom is the fundamental unit of matter and it contains an equal number of protons and electrons in its nucleus which makes it electrically neutral. An ion however, is an atom containing an unequal number of protons and electrons which means it will either carry a net positive charge or negative charge depending on whether there are more electrons or protons.
Answer:
atoms are neutral or they have equal number of proton and electron but ions can be cation(positively charged) or anion(negatively charged) based on the number of electron the atom lose and gain respectively
A hockey player is wearing ice skates and pushes against the wall propelling her backward on the ice. According to Newton's third law of motion, which of the following best compares the forces acting between the wall and the hockey player?
A.
The forces are equal and applied against gravity.
B.
The forces are equal and applied in the opposite direction.
C.
The forces are different sizes and applied in the opposite direction.
D.
The forces are equal and applied in the same direction.
Answer:
The forces are equal and applied in the opposite direction
Explanation:
Study island 100
If the positive end of a water molecule were to encounter the surface shown above, what might happen to the surface’s negative charges? Explain your reasoning.
Answer:
The negative charges of the surface will be attracted to the positive ends of the water molecule
Explanation:
A water molecule is a polar molecule. This means that the two ends of a water molecule are oppositely charged with one end being positive and the other end being negative.
When the positive end of a water molecule encounters a surface as shown in the attachment, where positive and negative charges are evenly distributed at rest, with the negative charges free to move, the negative charges will be attracted to the positive end of the water molecule due to the principle of electrostatics which states that unlike charges attract, while like charges repel. This means that negative and positive charges are attracted to each other while positive and positive or negative and negative charges are repelled from each other. Therefore, the water molecule will adhere to the surface because of the attraction between opposite charges.
The unlike charges will attract as expected based on the laws of electrostatics.
According to the laws of electrostatics, like charges repel while unlike charges attract. We are told in the question that water is a polar molecule with a positive and a negative end.
If the positive end of water dipole approaches the negative charges on the surface, the unlike charges will attract as expected based on the laws of electrostatics.
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11. Silver ions can be precipitated from aqueous solutions by the addition of aqueous chloride:
KCl(aq) + AgNO3(aq) → AgCl(s) + KNO3(aq)
Silver chloride is virtually insoluble in water so that the reaction appears to go to completion. How many grams of solid KCl must be added to 25.0 mL of 0.125 M AgNO3 solution to completely precipitate the silver?
Answer:
0.2330 grams of solid KCl
Explanation:
In order to find KCl in grams, we need to convert from moles to moles to grams..
However, we are given the volume and the molarity, so first we will use that to convert to moles of AgNO3 (silver nitrate) and then use that to convert to moles of KCl and finally to grams of KCl..
-----------------------------------------------------------------------------------------------------------------
Step 1 -> We need to convert milliliters to liters
(25.0 ml)([tex]\frac{1 L}{1000 mL}[/tex]) = 0.025 L
Step 2 -> Convert from liters and molarity to just moles of AgNO3
(0.025 L)(0.125 [tex]\frac{moles AgNO_{3} }{1 ln soln}[/tex]) = 0.003125 moles [tex]AgNO_{3}[/tex]
**Liters cancel out, so just multiply across...
Step 3 -> Now that we have moles of AgNO3, we will convert to moles of KCl
We will do this using the balanced equation
We see that in the balanced equation, for every mol of AgNO3 that reacts, one mol of KCl will react too. So we will set the dimensional analysis up like the following:
(0.003125 moles AgNO3) * [tex]\frac{1 mol KCl}{1 mol AgNO3}= 0.00312 mol KCl[/tex]
Step 4-> So now that we have moles of KCl, we will just convert to grams
We will do this using the molar mass (atomic mass) of KCl to convert to grams
0.00312 mol KCl * [tex]\frac{74.5513 grams KCl}{1 mol KCl} = 0.2329728125 grams of KCl[/tex]
This can be rounded to 0.2330 grams of KCl
Explain in brief how the non-covalent weak interactions play a major role in biomolecular structure.
Answer:
See explanation
Explanation:
Many bimolecuar structures are formed by non-covalent interactions such as hydrogen bonding.
A typical example that comes in handy here is the bimolecular structure of acetic acid. In the structure of acetic acid, we notice that the molecule exists as dimmers. This dimmeric structure accounts for its high boiling point.
The dimmeric structure stems from non-covalent hydrogen bonded interaction between acetic acid molecules as shown in the image attached.
PLZ HELP ME OUT OF THIS QUESTION....
Oxidation number of Cl in the following compound
Ca(ClO3)2
A:+5
B:+2
C:+3
D:+6
Answer:
It should be A) +5
Explanation:
How do fossils provide evidence that evolution has happened on Earth?
Answer:
i dunno
Explanation:
Answer:
Explanation:
Evidence for early forms of life comes from fossils. By studying fossils, scientists can learn how much (or how little) organisms have changed as life developed on Earth. There are gaps in the fossil record because many early forms of life were soft-bodied, which means that they have left few traces behind.
What is the standard reduction potential,E, for the half-reaction Zn2+(aq)+2e- -> Zn(s)?
Answer:
E = -0.76 V
Explanation:
The potential between the anode and the cathode is called standard reduction potential. It gives the tendency of the species to get reduced.
The given half reaction is :
[tex]Zn^{2+}(aq)+2e^{-}\rightarrow Zn(s)[/tex]
Zn²⁺ is the reduced form of Zn.
It is a stronger reducng agent.
Its standard reduction potential (E) has a sandard value.
E = -0.76 V
Hence, the correct option is (c).
A metal ball and beaker of water are at room temperature. The ball is heated and immediately placed in the water. Which statement describes the energy transfers as the ball and the beaker of water approach thermal equilibrium?
A. The energy gained by the water will equal the energy lost by the surroundings.
B. The energy lost by the water and the cube will equal the energy lost by the surroundings.
C. The energy lost by the cube will equal the energy gained by the water and the surroundings.
There is a law called conservation of energy which states that energy can neither be created nor be destroyed. It can be only transferred from one form to another form. Therefore, the correct option is option A.
What is energy transfer in thermodynamics?Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.
Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. The energy gained by the water will equal the energy lost by the surroundings.
Therefore, the correct option is option A.
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Two nitrogen atoms form a diatomic molecule. Which type of bond is most likely to be formed in the case of a diatomic nitrogen molecule?
A. Single Bond
B.Double Bond
C.Triple Bond
D.Ionic Bond
Explanation:
It's a triple bond for nitrogen,double bond for oxygen(just saying)
Different isotopes of the same element must have a different
Answer:
they must have same atomic number and different atomic mass
3.5x10^5 x 4.81x10^-3
Answer:
there u go
Explanation:
Atomic number of a member of halogens
giving brainliest answer it
Answer:
B as its not specific enough
Which statement is FALSE?
A) Reproduction requires a lot of energy!
B) Some organisms choose not to reproduce because it uses too much energy.
C) Some organisms die after giving birth to their offspring. (Offspring means children).
D) Some organisms may fight to the death to mate with a female.
One role of enzymes in the human body
digestion
does that answer it?
A hypothesis is a
a. concise statement of behavior that is always the same under the same conditions
b. set of quantitative data
C. tentative explanation or predication based upon experimental observations
d. well-tested unifying principle that explains a body of facts
e. mathematical formula that models a pattern of behavior
concise statement of behavior that is always the same under the same conditions
Answer:
the answer is c or d
Explanation:
you can cross out e because it dont make any sense
b thats just data
a is the definition of law
How many liters of 0.305 m K3PO4 solution are necessary to completely react with 187 ml of 0.0184M NiCl2 according to the balanced chemical reaction:
2 K3PO4(aq) + 3NiCl2(aq)>Ni3(PO4)2(s) +6 KCl(aq)
Answer:
0.00752L of 0.305M K₃PO₄
Explanation:
Based on the balanced chemical equation, 2 moles of K₃PO₄ react with 3 moles of NiCl₂.
To find the volume of K₃PO₄ we need to determine the moles of this compound required for a complete reaction finding moles of NiCl₂ and using the chemical equation:
Moles NiCl₂:
187mL = 0.187L * (0.0184mol / L) = 0.00344 moles NiCl₂
Moles K₃PO₄:
As 2 moles of K₃PO₄ react with 3 moles of NiCl₂:
0.00344 moles NiCl₂ * (2 mol K₃PO₄ / 3 moles NiCl₂) =
0.002294 moles of K₃PO₄
Volume of 0.305M K₃PO₄:
0.002294 moles of K₃PO₄ * (1L / 0.305moles K₃PO₄) =
0.00752L of 0.305M K₃PO₄
What happens at the cathode in an electrolytic cell?
(Answer is reduction)
Answer:
At the cathode in an electrolytic cell, ions in the surrounding solution are reduced into atoms, which precipitate or plate out on to the solid cathode. The anode is where oxidation takes place, and the cathode is where reduction takes place.
Explanation:
Since positive ions pick up electrons at the negatively charged cathode, reduction takes place there.
What is reduction?The process of obtaining electrons or a decrease in an element's oxidation state in such a chemical reaction would be known as reduction, which is the movement of electrons among species. An increase in the number of electrons connected to a single or a collection of atoms is the result of a reduction chemical process.
What is electrons?The electron would be a subatomic particle with a negative one elementary charge electric charge. Due to their lack of components or substructure, electrons, which are part of the lepton particle family's first generation, have been typically regarded to be elementary particles.
In an electrolytic cell, the cathode is where ions in the neighboring medium could be converted into atoms, which then plate out or precipitated onto the solid cathode. Both oxidation and reduction occur at the anode but also cathode, respectively.
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1. How many elements within the periodic table are classified as
nonmetals?
A. 10
B. 15
C. 21
D. 28
Answer:
it is actually 17 but the closest would be 15.
B. 15
