A mixture of propane and air with an equivalence ratio 0.9 (i.e. a weak mixture) is contained in a rigid vessel with a volume of 0.5 m3 at a pressure of 1 bar and 300 K. It is ignited and after combustion the products are at a temperature of 2600 K and a pressure of 9.06 bar. Calculate
(a) the amount of substance in the reactants;
(b) the amount of substance in the products and
(c) the amount of substance in the products per unit amount of substance supplied in the fuel.