The internal energy change (in J) when 90 g of water undergoes complete evaporation at 100°C is ...............

(Given : ΔH_{vap} 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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