Homework Help: Chem

Posted by Chase on Friday, March 23, 2012 at 7:19pm.

Calculate the final temperature when a 16.2 gram sample of ice at 0oC is placed into a styrofoam cup containing 128 grams of water at 79.0 oC. Assume that there is no loss or gain of heat from the surroundings.

Heat of fusion of ice = 333 Jg-1
Specific heat of water = 4.184 JK-1g-1

Final temperature = oC

Calculate the entropy change that occurs during this process.

Entropy change = JK-1

Chem - DrBob222, Friday, March 23, 2012 at 9:48pm
heat to melt ice + heat to raise T of melted ice to final T + heat lost by water initially at 79 C.

[mass ice x heat fusion] + [mass melted ice x specific heat H2O x (Tfinal-Tinitial)] + [mass warm water x specific heat H2O x (Tfinal-Tinitial)] = 0
Solve for Tfinal.

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