1.65 moles of an ideal gas, for which , is subjected to two successive changes in state:...

1.65 moles of an ideal gas, for which , is subjected to two successive changes in state: (1) From 39.0°C and , the gas is expanded isothermally against a constant pressure of to twice the initial volume. (2) At the end of the previous process, the gas is cooled at constant volume from 39.0°C to -25.0°C. Calculate q, w, ΔU, and ΔH for each of the stages. Also calculate q, w, ΔU, and ΔH for the complete process.