\(0.16 \mathrm{~g}\) of methane when burnt increases the temperature of \(100 \mathrm{~g}\) of water by \(40^{\circ}(\mathrm{C})\), what is the heat of combustion of methane if the heat capacity of water is \(4.2 \mathrm{Jg}^{-10} \mathrm{C}^{-1}\) ? \(\left(\mathrm{CH}_{4}=16 \right)\).