- The molar volume in the gaseous state is much larger (about 1000 times larger) than the liquid state.
- The volume of a gas is the volume of the container it occupies
- As the molar mass of the gas increases the molar volume of a gas at STP decreases
- As the number of atoms per molecule (atomicity) increases the molar volume of a gas at STP decreases
- To Calculate the mass of mole of gas at STP
Kinetic theory of gases:
· The tiny particles of a gas are moving at random, colliding with each other and with the walls of the container.
· As particles of a gas collide with the walls of the container they exert pressure
· Average kinetic energy of a gas is constant at constant temperature.
· As temperature increases average kinetic energy of a gas increases
· As temperature increases particles move more rapidly, they collide with the wall of the container more frequently and more strongly pressure of the gas increases.
The product PV is constant for an ideal gas while it is only approximately constant for a real gas.
A real gas behave like an ideal gas at high temperatures and low pressures.
As pressure increases and volume decreases a time comes where a real gas liquefies, PV= constant
does not apply anymore.
As the temperature of a fixed mass of gas at constant pressure increases, so does its volume.
