DF 8 - Gas Volumes Flashcards
What are the number of molecules in one mole of gas?
6.02x10^23 (Avagadro’s constant)
What is the rule for equal volumes of gases?
At the same temperature and pressure, they contain an equal number of molecules
Why do equal volumes of gases at the same temperature and pressure contain an equal number of molecules?
- The number of molecules in one mole of gas is the same
- The molecules in a gas are very far apart compared to the actual size of each molecule, so there is a negligible effect on the total volume
Define “molar volume”
Volume occupied by one mole of any gas at a particular temperature and pressure
What is the molar volume of any gas at standard temperature and pressure?
24.0dm^3
What is the formula for calculating the number of moles in a gas?
volume/molar volume (they must be the same unit)
What is the ideal gas equation?
PV=nRT
What does the “P” stand for in the ideal gas equation and what are its units?
Pressure - pa (pascals)
What does the “V” stand for in the ideal gas equation and what are its units?
Volume - m^3
What does the “R” stand for in the ideal gas equation and what is it?
Gas constant - 8.314JK-1mol-1
What units of temperature are used in the ideal gas equation?
K
How could a gas syringe be used to calculate the volume of gas produced in a reaction?
By attaching it to the opening of a reaction vessel
What shows a reaction has finished?
When there is no further change in gas volume
What is the setback of a gas syringe?
It only shows total volume, not individual gas volumes
