The internal energy change (in J) when 90 g of water undergoes complete evaporation at 100°C is ...............
(Given : ΔHvap for water at 373 K = 41 kJ/mol, R = 8.314 JK–1 mol–1)
Numerical Value Type
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Ans. (189494)
Sol. ΔH = ΔU + ΔngRT
41000 × 5 = ΔU + 5 × 8.314 × 373
205000 = ΔU + 15505.61
ΔU = 189494.39 J = 189494 J
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