When 20.0 grams of a substance is completely melted at its melting point, 820 joules are absorbed, what is the heat of fusion of this substance?

Heat of fusion of this substance is 41 J/g

Explanation:

Latent heat of fusion is the amount of heat required to convert 1 g of solid to liquid at atmospheric pressure.

It is given that amount of heat required to melt 20 gram of a substance= 820 J

Heat required to melt 20 g of a substance= 820 J

Thus Heat required to melt 1 g of  a substance=

Thus heat of fusion of this substance is 41 J/g

unbalanced force

explanation:

option number c is the right answer.