Thermochemistry?

1 Answer
Doc048
May 26, 2017

Heat to evaporate 10 grams HOH = 5400 calories = 22,600 joules

Explanation:

The phase change energy of water can be calculated using
Q = m DeltaH_(transition) where m is mass and DeltaH_(transition) is the transition constant per unit mass of water. For evaporation or condensation the constant is Heat of Vaporization DeltaH_(v) = 540 ("calories")/(gram) and for freezing or melting the constant is Heat of Fusion DeltaH_f = 80 "calories"/"gram". To convert to Joules, use the relationship 4.184 joules = 1 calorie.

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