To calculate the heat needed to melt a block of ice at its melting point what do you need to know?
a. the mass and amount of work done
b. the mass, temperature change, and specific heat capacity.
c. the mass and the latent heat of vaporization.
d. the mass and the latent heat of fusion.

D.The mass and the latent heat of fusion.

Explanation:

When a block of ice is at its melting point, it doesn't need any additional heat in order to reach that temperature. Instead, it needs heat in order to break the bonds between the molecules and change state from solid to liquid. During the phase change, the temperature of the substance does not change, since all the heat provided is used to break the bonds between the molecules.

The heat needed for the phase change is

where

m is the mass of the block

is the latent heat of fusion

Therefore, we see that the correct answer is

D.The mass and the latent heat of fusion.

the answer is b ) square root of 5