Question

In a certain lab, a mixture of three gases was collected over water into a clean, dry, evacuated glass vessel. The partial pressure of the gas mixture was measured and found to be $732.5mmHg$ at room temperature. If the temperature of the collect gas in the vessel is changed from the original temperature of ${25}^{\circ }C$ to ${50}^{\circ }C$, how will the pressure of the vessel be affected?

• A. The pressure of each gas will increase but the overall pressure will remain constant.
• B. The partial pressures of each gas will decrease while the total pressure increases.
• C. The partial pressure of the individual gases remains constant as well as the total pressure of the mixture.
• D. The partial pressure of each gas increases along with the total pressure of the mixture.

Answer 1

The correct option is D The partial pressure of each gas increases along with the total pressure of the mixture.

$P_{total}$ be total pressure of gas at 25 degrees Celcius.

We know $PV=nRTP\propto T$

As temperature increases, pressure also $P_{total}$ also increases.

$P_{partial}=x{P}_{total}$

As $P_{total}$ increases, $P_{partial}$ also increases.

Ans: Partial pressure of each gas increases along with total pressure of the mixture.