The internal energy change (in J) when 90 g of water undergoes complete evaporation at 100ºC is…………… (Given : Hvap for water at 373 K = 41 kJ/mol, R = 8.314 JK–1 mol–1)

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Prashant Kotian · Accepted Answer

Correct answer: .. H = U + ngRT 41000 X 5 = U + 5 X 8.314 X 373 205000 = U + 15505.61 U = 189494.39 J = 189494 J

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