Quantity of ideal gas whose ratio of principal molar heat capacities is 5:3 has a temperature 300K, volume 0.064m^3 and pressure 243kpa.it reversible isothermal of volume 0.064.calculate temperature ?

Quantity of ideal gas whose ratio of principal molar heat capacities is 5:3 has a temperature 300K, volume 0.064m^3 and pressure 243kpa.it reversible isothermal of volume 0.064.calculate temperature ?