Question

The heat of fusion of silicon is 43.4 kJ/mol. How much energy would be needed to melt a 5.24 g sample
of silicon at its melting point of 1693 K?

Answer 1

heat of fusion is given as 43.4 kj/mol

so we have to convert 5.24g silicon to moles. divide g / molar mass of silicon to get moles. from there, multiply by 43.4 kJ/mol to get heat in kJ.