# A 475 mL sample of gas is collected over water at 27°C and a total pressure of 675 mm Hg. If...?

A 475 mL sample of gas is collected over water at 27°C and a total pressure of 675 mm Hg. If the vapor pressure of water at 27°C is 26.7 torr, what is the volume of the gas sample at standard pressure?

The total pressure of a system is the sum of the partial pressures of the individual gases. Therefore, the pressure of the sample of gas is the total pressure minus the partial pressure of the water vapor.

Use that information to solve for n in PV=nRT, then solve PV=nRT again, this time for V, using standard pressure and your computed n.
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