1.
One mole of ideal diatomic gas (CV=5cal mol1K1C_V = 5\,\text{cal mol}^{-1}\text{K}^{-1}) goes from 25°C, 1 L to 100°C, 10 L. Entropy change (R=2cal mol1K1R = 2\,\text{cal mol}^{-1}\text{K}^{-1}):