A system comprises of 1mol of hydrogen bromide molecules at 300K and 1 bar. Given that the moment of inertia and the internuclear distance for HBr are is 3.307 1040gcm2 and 141.4pm, respectively. (a) Starting from the expression of complexion, , derive the expression for heat capacity at constant volume, CV (10 marks) (b) Calculate the contribution of translational, rotational, vibrational and electronic motions to the molar heat capacity, C. (10 marks) Given: qt=(h22mkT)3/2V;qr=h282IkT;qv=1ehv/kT1;qe=1