A Sample of Octane in Equilibrium with Its Vapor in a Closed

A sample of octane in equilibrium with its vapor in a closed 1.0-L container has a vapor pressure of 50.0 torr at 45 $\degree$ C. The container's volume is increased to 2.0 L at constant temperature and the liquid/vapor equilibrium is reestablished. What is the vapor pressure?

A) > 50.0 torr
B) 50.0 torr
C) 25.0 torr
D) The mass of the octane vapor is needed to calculate the vapor pressure.
E) The external pressure is needed to calculate the vapor pressure.

Correct Answer:

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