Ideal Gas Law

1. Use the ideal gas law and molar volume of a gas to convert between moles and volume of gas, and relate molar mass to gas density.

Some Formulas

Molar volume of a gas at STP is 22.7 (or 22.4 depending on the standard being used) L/mol.

P = pressure V = volume n = number of moles T = temperature R = ideal gas constant (0.0821 L atm / mol K)

Ideal Gas Law

Ideal Gas Law: Any gas at ideal conditions (100kPa, 1 mol, 273.15K) will be 22.7L in volume.

If the conditions are not ideal, meaning the gas is not at 100kPa, 1 mol, and 273.15K, then the volume of the gas will be different, and the formula can be used.

Caution

The ideal gas law applies if and only if all of the following conditions are met: 100 kPa, 1 mole, 273.15 K.

[Advanced] Partial Pressure

Partial Pressure: The pressure of a gas in a mixture of gases. The total pressure of a gas mixture is the sum of the partial pressures of the individual gases.

Mole Fraction in relation with Partial Pressure: where is the mole fraction of gas A.