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3 years ago

If 498 mol of octane combusts, what volume of carbon dioxide is produced at 23.0 °c and 0.995 atm?

1 answer:

5 0

Octane on combustion yields CO₂ and H₂O;

2C₈H₁₈ + 2 5O₂ → 16 CO₂ + 18 H₂O

According to equation,

2 moles Octane produces = 16 moles of CO₂
So,
498 moles Octane will produce = X moles of CO₂

Solving for X,
X = (498 mol × 16 mol) ÷ 2 mol

X = 3984 moles of CO₂

Now, Calculating for Volume,
As,
P V = n R T
Solving for V,
V = n R T / P ------- (1)

Pressure = P = 0.995 atm
Volume = V = ? 
Moles = n = 3984 
Gas Constant = R = 0.0821 L.atm.K⁻¹.mol⁻¹ 
Temperature = T = 23 + 273 = 296 K

Putting values in eq. 1

V = (3984 mol × 0.0821 L.atm.mol⁻¹.K⁻¹ × 296 K) ÷ 0.995 atm

Volume = 973040.95 L

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Answer:

P1V1= P2V2

Explanation:

Inverse relationship

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3 years ago

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2 years ago

Boyle's law states that the pressure of a gas is always:

natka813 [3]

Answer:

d. inversely proportional to the volume of its container.

Explanation:

Boyle's law states that at constant temperature and number of moles, the pressure of the gas is inversely proportional to the volume of the gas.

Thus, P ∝ T

P is the pressure

T is the temperature

For two gases at same temperature, the law can be written as:-

${P_1}\times {V_1}={P_2}\times {V_2}$

Thus, according to the question, the answer is:- d. inversely proportional to the volume of its container.

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3 years ago

What is the type of mutation represented by the amino acid sequence below?

Ilia_Sergeevich [38]

Answer:

Substitution mutation

Explanation:

A substitution mutation is a type of mutation in which one or more nucleotide base is replaced by another in a sequence. This will result in the replacement of one or more amino acid in the amino acid sequence.

This is the case in this question where the original amino acid sequence was given as: Leucine – Alanine – Glycine – Leucine. After mutation, the following mutated sequence was produced: Leucine – Alanine – Valine – Leucine.

As illustrated above, one would notice that there is replacement of GLYCINE amino acid by VALINE in the mutated sequence, hence, it is an example of SUBSTITUTION MUTATION.

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3 years ago

In air, a silver object can tarnish due to the reaction of silver with hydrogen sulfide, a gas found in the air as a result of c

cluponka [151]

Answer:

The coefficient of Ag is 2.

Explanation:

___Ag (s) + ___H₂S (g) ⇒ ___ Ag₂S (s) + ___ H₂(g)

The Law of Conservation of Matter is also called the law of conservation of mass or the Law of Lomonósov-Lavoisier. This law postulates that "the mass is not created or destroyed, only transformed." This means that the reagents interact with each other and form new products with physical and chemical properties different from those of the reagents because the atoms of the substances are ordered differently. But the amount of matter or mass before and after a transformation (chemical reaction) is always the same, that is, the quantities of the masses involved in a given reaction must be constant at all times, not changing in their proportions when the reaction ends.

In others words, the law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.

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Left side: 1 Ag, 2 H and 1 S

Right side: 2 Ag, 2 H and 1 S

The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.

By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction.

You can see that the elements H and S are balanced because we have the same quantity on both sides of the reaction. Then you must balance the Ag, so the reaction is:

2 Ag (s) + 1 H₂S (g) ⇒ 1 Ag₂S (s) + 1 H₂(g)

Now you have:

Left side: 2 Ag, 2 H and 1 S

Right side: 2 Ag, 2 H and 1 S

So, you have the same amount of each element to both of the reaction and this is balanced.

Then, the coefficient of Ag is 2.

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3 years ago