Tuesday
September 2, 2014

Homework Help: physics

Posted by Jon on Thursday, April 3, 2008 at 5:14pm.

The melting point of a solid is 90.0 d/C. What is the heat required to change 2.5 kg of this solid at 40.0 d/C to a liquid? The specific heat of the solid is 390 J/kg-K and its heat of fusion is 4000 J/kg.

I got 2 different answers 2 different ways:

2.5(50)(4000) which is 5.0 x 10^5 J or, 2.5(4000) which is 1.0 x 10^4 J

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