# Some very hot rocks have a temperature of #960 ^o C# and a specific heat of #250 J/(Kg*K)#. The rocks are bathed in #50 L# of boiling water. If the heat of the rocks completely vaporizes the water, what is the minimum combined mass of the rocks?

##### 1 Answer

Apr 2, 2018

The minimum combined mass of the rocks is

#### Explanation:

The latent heat of vaporization of water is

Now, the least temperature that the hot rocks can reach is

if their combined mass is

or hence