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Q.

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

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answer is 189494.

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Detailed Solution

H2Ol→ H2OgΔH=Δu+Δng RT =Δu+RTΔu=ΔH−RT =41000−8.314×373 = 37898.878 Jmol−1For 5 mole=Δu=189494.39

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