Question

Consider a mixture of two gases, A and B, confined in a closed vessel. A quantity of a third gas, C, is added to the same vessel at the same temperature. How does the addition of gas C affect the following: (a) the partial pressure of gas A, (b) the total pressure in the vessel, (c) the mole fraction of gas B?

Answer 1

The addition of gas C does not affect the partial pressure of gas A, but it does increase the total pressure in the vessel. The mole fraction of gas B is not affected by the addition of gas C.

Step-by-step explanation:

When a quantity of gas C is added to a mixture of gases A and B in a closed vessel at the same temperature, the addition of gas C does not affect the partial pressure of gas A. The partial pressure of gas A remains the same because it only depends on the moles of gas A and the total pressure of the mixture.

The addition of gas C does increase the total pressure in the vessel. The total pressure is the sum of the pressures exerted by each gas individually. So, with the addition of gas C, the total pressure increases.

The mole fraction of gas B in the mixture is not affected by the addition of gas C. The mole fraction of gas B is determined by the moles of gas B divided by the total moles of all gases in the mixture, and the addition of gas C does not change the moles of gas B.

Answer 2

(b) the total pressure in the vessel and (c) the mole fraction of gas B

Step-by-step explanation:

First off, it's important to understand that total pressure is dependent on the constituent gas mixtures as stated by Dalton;

Dalton's Law of Partial Pressure states the total pressure exerted by a mixture of gases is equal to the sum of the partial pressure of each individual gas.

This means that each gas has it's own partial pressure, hence the addition of has C cannot affect the partial pressure of A.

Only the total pressure in the vessels would be increased due to the addition of new gas molecules with it's own partial pressure to contribute to the tal pressure of the gas mixture.

The mole fraction of B would also be affected because;

In chemistry, the mole fraction or molar fraction (xi) is defined as the amount of a constituent (expressed in moles), ni divided by the total amount of all constituents in a mixture (also expressed in moles).

Since the total number of moles would change due to addition oof C, then mole fraction of B would also be affected.