How Much Heat Energy Is Required to Vaporize a 1 $\degree$

Multiple Choice

How much heat energy is required to vaporize a 1.0-g ice cube at 0 $\degree$ C? The heat of fusion of ice is 80 cal/g. The heat of vaporization of water is 540 cal/g, and c_water = 1.00 cal/g· $\degree$ C.

A) 620 cal
B) 720 cal
C) 820 cal
D) 1 kcal