Consider the slow adiabatic expansion of a closed volume of gas for which CP=(7/2)R. If the initial gas temperature is 825 K and the ratio of the final pressure to the initial pressure is 1/3, what is...

Consider the slow adiabatic expansion of a closed volume of gas for which CP=(7/2)R. If the initial gas temperature is 825 K and the ratio of the final pressure to the initial pressure is 1/3, what is the change in enthalpy of the gas, the change in internal energy, the heat transferred Q, and the work W? Assume a basis of 1 mol of gas.