How much heat is needed to heat 5 kg of water taken at a temperature of 24 degrees Celsius and completely evaporate?

Heat:
Q = cm (t2-t1) = 4200J / kg * C * 5kg * (100-24) = 1596000 J
Evaporate:
Q = Lm = 2300000J / kg * 5 kg = 11500000 J
1596000 + 11500000 = 13096000 J = 13096 kJ



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