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

question 86

Multiple Choice

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°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.

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