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9120 a. Arrive at the expression for the 'Total entropy change' in irreversible (spontaneous) process of a perfect gas. 5M b. Calculate w and U,

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9120 a. Arrive at the expression for the 'Total entropy change' in irreversible (spontaneous) process of a perfect gas. 5M b. Calculate w and U, when 2.4 moles of water at 100 C is converted to steam at 1 atm pressure. Heat of vaporisation of water at 100 C is 40670 J/ mole. (5M)

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