An ideal gas is heated from \(25^{\circ} \mathrm{C}\) to \(145^{\circ} \mathrm{C}\). The mass of the gas is \(2 \mathrm{~kg}\). Determine: (i) specific heats, (ii) change in internal energy, (iii) change in enthalpy. Assume \(\mathrm{R}=287 \mathrm{~J} / \mathrm{kgK}\) and \(r=1.4\) for the gas.