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A sample of water in equilibrium with its vapor in a closed 0.8-L container has a...

A sample of water in equilibrium with its vapor in a closed 0.8-L container has a vapor pressure of 23.7 torr at 25°C. The container's volume is increased to 2.2 L at constant temperature and the liquid/vapor equilibrium is reestablished. What is the vapor pressure?

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