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# Homework Help: Chemistry

Posted by Thao on Tuesday, April 12, 2011 at 12:20am.

How many grams of ice are needed to cool 250 ml of water from 75 degrees celcius to 5 degrees celcius?

• Chemistry - DrBob222, Tuesday, April 12, 2011 at 12:54am

Note the correct spelling of celsius.
Heat gained by ice + heat gained by melted water + heat lost by original water = 0

[mass ice x heat fusion] + [mass melted ice x specific water x (Tfinal-Tinitial)] + [mass 250mL water x specific heat water x (Tfinal-Tinitial)] = 0
Solve for mass ice (and melted ice). I think something like 200 g ice is necessary but that is an aproximation.

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