\(0.16 \mathrm{~g}\) of methane when burst raises 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 \(4.2 \mathrm{Jkg}^{-}\) \({ }^{1} \mathrm{C}^{-1} ?\left[\mathrm{CH}_{4}=-16
ight]\)