A sample of water in equilibrium with its vapor in a closed 3-L container has a vapor pressure of 23.8 torr at 25°C. The container's volume is increased to 7 L at constant temperature and the liquid/vapor equilibrium is reestablished. What is the vapor pressure?

The vapor pressure of this liquid in a closed container remains the same and as such would be equal to 23.8 torr.

Given the following data:

To determine the final vapor pressure of a sample of water in equilibrium with its vapor:

What is vapor pressure?

Vapor pressure can be defined as the pressure exerted by a vapor in thermodynamic equilibrium with a liquid or solid that is placed in a closed container at a specific temperature.

On a related note, the vapor pressure of a liquid is the pressure exerted by a vapor when its liquid in a closed container evaporates above the liquid sample.

At a constant temperature, the vapor pressure of a liquid in a closed container would always remain the same provided that vapor equilibrium is reached in the container having a new volume.

In this context, the vapor pressure of this liquid in a closed container remains the same and as such would be equal to 23.8 torr.

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23.8 torr

Explanation:

Vapor pressure of a liquid is simply the pressure of the vapor that arises when the liquid evaporates in a closed container above the liquid sample.

From the question given above, the vapor pressure is 23.8 torr at 25°C. Since the temperature is constant, the vapor will remain the same when equilibrium is reached in the new container as vapor pressure depends on the temperature of the liquid.

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