Posted by **Tiffany** on Monday, February 27, 2012 at 1:22pm.

The specific heat of solid copper is 0.385 J/g*C. What thermal energy change occurs when the temperature of a 40.10g sample of copper is cooled from 42.9C to 10.0C? Be sure to give you answer the proper sign.

I know this is part of the answer which

(42.9-10.0)*40.10*0.385=508 the second of the answer is where I am confused on

This is amount of heat is used to melt solid ice at 0.0C. The molar heat of fusion of ice is 6.00 kJ/mol. How many moles of ice are melted?

- Chemistry -
**DrBob222**, Monday, February 27, 2012 at 1:59pm
I use q = mass x specific heat x (Tfinal-Tinitial) which automatically takes care of the sign. Since the Cu is being cooled, it is giving off heat and that makes q negative. The problem states that proper sign should be used so I would make that -508 J.

mols ice x 6.00 kJ/mol = 0.508

Solve for mols ice.

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