Owing to the intermolecular interactions of water molecules (in a pure water), the latent heat of freezing (fusion) is and the latent heat of melting is .

a) 1 cal/g and 10 cal/g

b) 40 cal/g and 540 cal/g

c) 80 cal/g and 80 cal/g

d) 40 cal/g and 80 cal/g

Option (c) is the correct answer.

Explanation:

Latent heat is defined as the amount of heat required by per mole of a substance in order to change its state.

And, latent heat of freezing (fusion) is defined as the energy required for the phase change between a liquid and a solid without any change in their temperature.

Latent heat of freezing of pure water is or -80 cal/g. Basically, the negative sign indicates heat is being released.

The amount of energy released by per mole of a substance when it changes its phase from solid to liquid is known as latent heat of melting.

For example, latent heat of melting of pure water is 80 cal/g.

thus, we can conclude that owing to the intermolecular interactions of water molecules (in a pure water), the latent heat of freezing (fusion) is 80 cal/g and the latent heat of melting is 80 cal/g.