Homework Help: Chemistry

Posted by Leah on Monday, July 19, 2010 at 9:47pm.

The heat of fusion for water is 80cal/g. The specific heat of liquid water is 1.00cal/g. How many calories of heat are released when 20g of water at 30 degrees is cooled to 0 degrees and frozen to ice at 0 degrees?

Chemistry - DrBob222, Monday, July 19, 2010 at 9:57pm
q1 = heat released when cooled from 30 to zero C.
q1 = mass x specific heat x delta T.

q2 = heat released when water at zero C is frozen.
q2 = mass water x heat fusion.

total heat released is q1 + q2.

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