Question

1,000 J of energy are needed to melt 10 g of a solid substance that is already at its melting point. What is the heat of fusion of the substance?

A. 10,000 J/g

B. 100 J/g

C. 0.01 J/g

D. 1,000 J/g

Answer 1

Option B) 100J/g is the correct answer.

Hence, the heat of fusion of the solid substance is 100J/g.

Given the data in the question:

• Amount of heat needed to melt the substance; $Q = 1000J$

• Mass of the substance; $m = 10g$

Heat fusion of the substance; $H_f = \ ?$

Heat of fusion

Heat of fusion is simply the amount of heat required to convert one gram of a solid to a liquid with no temperature change.

It is expressed as:

$H_f = \frac{Q}{m}$

Where Q is the amount of heat needed to melt the substance and m is the mass of the substance.

We substitute our given values into the equation

$H_f = \frac{1000J}{10g} \\\\Hf = 100J/g$

Option B) 100J/g is the correct answer.

Hence, the heat of fusion of the solid substance is 100J/g.

Learn more about heat of fusion: https://brainly.com/question/87248