Specific Heat of Ice and Copper

[liz_p88]

Homework Statement

A student wants to melt a 200 gram block of ice that is at minus 10.0°C and turn it into liquid water at 15.0°C. The student plans to do this by heating copper pellets to 100.0°C and then dropping them onto the block of ice in a thermally insulated container. How many grams of copper will the student need to use?

Homework Equations

mcΔT = - [mcΔT]

The Attempt at a Solution

(200g)(2.1 KJ/kg*K)(25°C) = -(m)(0.385 KJ/kg*K)(-85°C)

m = 320.86 g

DID I DO THIS CORRECTLY?

 

[lurflurf]

No. There are three steps.
1)heat ice from minus 10.0°C to its melting point
2)melt ice into water
3)heat water to 15.0°C
you will need the specific heats of ice, water, and copper and the heat of fusion of water.