Calculate, by explicit summation, the vibrational partitionfunction and the vibrational contribution to the molar internalenergy of I2 molecules at (a) 100 K (b) 298 K given thatits vibrational energy levels lie at the following wave numbers above the zero-point level: 0, 213.30, 425.39, 636.27, 845.93cm-1. What proportion of I2 molecules are inthe ground and first two excited levels at the two temperatures?Calculate the vibrational contribution to the molar entropy ofI2 at the two temperatures.