Please help ,e with chemistry heat math problem.

Question

What is the heat required to melt 62.0 g of solid ammonia, NH₃, at its melting point? The ΔH° of fusion of ammonia is 5.97 kJ/mol. Use a molar mass with at least as many significant figures as the data given.

 Answer in kJ

Answer 1

The △H of fusion of ammonia = 5.97 kJ/mol

The mass of NH₃ = 62.0g

The molar mass of NH₃ = 17.03g/mol

First we need to calculate the moles of NH₃:

62.0 g NH₃ x 1 mol NH₃/ 17.03g = 3.64 mol NH₃

Then we multiply the moles of NH₃ by the △H of fusion of NH₃:

3.64 mol NH₃ x 5.97 kJ/mol = 21.73 kJ