# 250.0 ml of oxygen gas was collected over water at 24.5 C and 771 Torr. What is the volume of the dry oxygen gas when conditions are changed to STP?

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250.0 ml of oxygen gas was collected over water at 24.5 C and 771 Torr. What is the volume of the dry oxygen gas when conditions are changed to STP?

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Step 1

Since the oxygen is collected over water, total pressure includes vapor pressure of water.

From the vapor pressure chart, vapor pressure of water at 24.50C is equal to 3.10kPa.

3.10kPa = 23.25 torr and given pressure of oxygen 771 torr.

Step 2

By Dalton’s law of Partial pressure, to determine the partial pressure of oxygen can be calculated as,

Step 3

At STP condition implies a temperature at 00C and pressure of 76...

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