Molar mass of methane = 16g/mol
At S.T.P. its 8g occupies 11.2
so 16g occupies 22.4 dm3^33
Molar mass of propane = 44g/mol−1^-1−1 occupies 22.4dm3^33 at S.T.P
so 22g will occupy 11.2dm3^33
