How much heat energy (in megajoules) is needed to convert 7 kilograms of ice at - 9°C to water at 0°C?

A. 2.48 MJ

B. 2.13 MJ

C. 3.26 MJ

D. 3.09 MJ

1. Energy released from changing the phase of a substance from the liquid phase to solid phase can be calculated by using the specific latent heat of fusion. The heat of fusion of water at 0 degrees Celsius is 334 J/g. Calculation are as follows:

Energy = 7000 grams x 334 J/g

Energy = 2338000 J or 2.38 MJ