What are the values of the standard pressure and standard temperature for gases (STP)?
What is a volume of one mole of gas at STP?
When a gas is collected over water by the water displacement method, it contains also water vapor ('wet gas'). If a gas is collected at 25 °C, and the barometer reads 767 mmHg, what is the partial pressure of the gas ('dry' gas)? The vapor pressure of water at 25 °C is 23.8 mmHg.
A hydrogen gas sample, collected in experiment, occupies 78.5 mL at 25 °C. The pressure of 'dry' hydrogen gas is 740 mmHg. Use the combined gas law formula to find the volume at STP.