A closed vessel of (0.15 mathrm{~m}^{3}) capacity contains a mixture of methane (left(mathrm{CH}_{4} ight)) and air, the

A closed vessel of \(0.15 \mathrm{~m}^{3}\) capacity contains a mixture of methane \(\left(\mathrm{CH}_{4}\right)\) and air, the air being \(20 \%\) in excess of that required for chemically correct combustion. The pressure and temperature in the vessel before combustion are respectively 3 bar and \(100{ }^{\circ} \mathrm{C}\). Determine:

a. the individual partial pressures and the weights of methane, nitrogen and oxygen present before combustion;

b. the individual partial pressures of the burnt products, on the assumption that these are cooled to \(100{ }^{\circ} \mathrm{C}\) without change of volume and that all the vapour produced by combustion is condensed.

(a) \(0.2415,2.179,0.579\) bar; \(0.01868,0.2951,0.08969 \mathrm{~kg}\).

(b) \(2.179,0.2415,0.0966 \mathrm{bar}]\)