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protractor
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Homework Statement
Calculate the amount of heat emitted when 12.4 g of water freezes to solid air.
Homework Equations
heat of fusion = 6.02 KJ
1 mol H2O = 18.02 g H2O
The Attempt at a Solution
12.4 g H2O x 1 mol H2O/ 18.02 g H2O x (-6.02 KJ) / 1 mol H2O = - 4.14 kJ
I am unsure whether the answer is positive or negative.
The answer in the book is positive 4.14 kJ, but freezing is exothermic ( releasing energy).