Steps and expiation please and thank you

Current Attempt in Progress We know that for an adiabatic process pVY = a constant. Evaluate "a constant" for an adiabatic process involving exactly 4.2 mol of an ideal gas passing through the state having exactly p = 1.3 atm and T = 281 K. Assume a diatomic gas whose molecules have rotation but not oscillation. Use the SI units for the given quantities but omit unit for the final result