Posted by **Completely Lost** on Sunday, December 28, 2008 at 11:57pm.

Calculate the heat released when 25.0 grams of water freezes at 0 degrees celsius.

- Chemistry -
**GK**, Monday, December 29, 2008 at 12:16am
a) Look up the molar heat (enthalpy) of fusion of water.

b) Convert 25 grams of H2O to moles by dividing by the formula mass of H2O.

c) Multiply (a) times (b)

- Chemistry -
**drwls**, Monday, December 29, 2008 at 12:47am
GK's method will work but let me save you a step.

The latent heat of fusion of water (the heat released when water turns to ice at 0 C) is 79.8 calories per gram. Many textbooks round it off to 80 cal/g. Multiply 79.8 by 25.0 grams for the answer.

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