One mole of argon is expanded polytropically, the polytropic constant being n=1.50.n=1.50 .n=1.50. In the process, the gas temperature changes by ΔT=−26 K\Delta T=-26 \mathrm{~K}ΔT=−26 K. Find: (a) the amount of heat obtained by the gas; (b) the work performed by the gas.