We know that for an adiabatic process pV = a constant. Evaluate a constant for an adiabatic

We know that for an adiabatic process pVγ = a constant. Evaluate "a constant" for an adiabatic process involving exactly 2.0 mol of an ideal gas passing through the state having exactly p = 1.0 atm and T = 300 K. Assume a diatomic gas whose molecules rotate but do not oscillate.