Physics 12.33 ex 4 page 233

Question

4.00×104 J of heat is added to 1.00 kg of ice at -12 degrees C. How much ice melts?

Answer 1

heat of fusion of ice is 334 kJ/kg

specific heat of ice is 2.06 kJ/kgC

First we have to raise the ice to the melting point. energy required to do that is:

E = 2.06 kJ/kgC x 1 kg x 12C = 24.7 kJ

We have 40 kJ, so subtract 24.7 kJ from that, leaving 15.3 kJ which can be applied to melting ice.

15.3 kJ = 334 kJ/kg x M

M = 0.0458 kg of ice is melted.

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