For each polyatomic gas in Table 18.1, compute the value of the molar heat capacity at constant volume, Cv, on the assumption that there is no vibrational energy. Compare with the measured values in the table, and compute the fraction of the total heat capacity that is due to vibration for each of the three gases. (Note: CO2 is linear; SO2 and H2S are not. Recall that a linear polyatomic molecule has two rotational degrees of freedom, and a nonlinear molecule has three.)