An ice cube at 0c was dropped into 30.0 g of water in a cup at 45.0c. at the instant that all of the ice was melted, the temperature of the water in the cup was 19.5c. what was the mass of ice cube?

The amount of heat given by the water to the block of ice can be calculated by using

where 
is the mass of the water
is the specific heat capacity of water
is the variation of temperature of the water.

Using these numbers, we find


This is the amount of heat released by the water, but this is exactly equal to the amount of heat absorbed by the ice, used to melt it into water according to the formula:

where  is the mass of the ice while  is the specific latent heat of fusion of the ice.
Re-arranging this formula and using the heat Q that we found previously, we can calculate the mass of the ice: