Calculate the relative molecular mass of CO2 if 300 ml of gas at STP weighs 0.30 g. Given 1 litre of H2 at STP weighs 0.09 g.
22.4 litres of a gas weighs 70 g at S.T.P. Calculate the weight of the gas if it occupies a volume of 20 litres at 27∘C and 700 mm Hg of pressure.