1. The problem statement, all variables and given/known data Suppose that 31.4 J of heat is added to an ideal gas. The gas expands at a constant pressure of 1.40x104 Pa while changing its volume from 3.00x104 to 8.00x104 m3. The gas is not monatomic, so the relation CP = 5/2R does not apply. (a) Determine the change in the internal energy of the gas. (b) Calculate its molar specic heat capacity CP . 2. Relevant equations 3. The attempt at a solution I have completed part a) using the knowledge that it is an isobaric process, but i'm a bit unsure of my answer for b) My text book says that for a diatomic ideal gas, Cp is given by 7/2 R, but the question only says the gas is not monatomic. Is there a piece of info i'm missing? Thanks!