Given that Cp = T(V/T)p - V, derive an expression for .u in terms of the van

Given that μCp = T(∂V/∂T)p - V, derive an expression for .u in terms of the van der Waals parameters a and b, and express it in terms of reduced variables. Evaluate u at 25°C and 1.0 atm, when the molar volume of the gas is 24.6 dm3 mol-1 use the expression obtained to derive a formula for the inversion temperature of a van der Waals gas in terms of reduced variables, and evaluate it for the xenon sample.