How much heat is required to vaporize a 3 g ice cube initially at 0◦C? The latent heat of fusion of ice is 80 cal/g and the latent heat of vaporization of water is 540 cal/g. The specific heat of water is 1 cal/(g · ◦ C). Answer in units of cal.

Answer : The amount of heat required is, 2160 cal.

Explanation :

The process involved in this problem are :

The expression used will be:

where,

= heat required for the reaction = ?

m = mass of ice = 3 g

= specific heat of liquid water =

= enthalpy change for fusion =

= enthalpy change for vaporization =

Now put all the given values in the above expression, we get:

Therefore, the amount of heat required is, 2160 cal.