1. The problem statement, all variables and given/known data Ideal gas of point particles is expanding so that its molar heat capacity Cx is constant and the work done by gas is W = 156J. Then the gas is isochorically heated to the initial temperature by receiving the quantity of heat which is Q = 125 J. Find Cx. 2. Relevant equations W=pΔV=nRΔT Q=nCvΔT 3. The attempt at a solution So first of all, we know that the second process is isochoric. Though we don't know the type of first process. Yet it can't be isochoric, because the work done is not equal to 0. It is also not isothermic, because there is a temperature change. So the first process is isobaric and the molar heat capacity we're looking for is Cp. I managed to derive from the two equations that Cv = A / (QR). Aaand I'm stuck. How do I connect the two molar heat capacities? Are my attempt at solution and assumptions correct?