A solid with a molecular weight of 148.0 g/mol is already at its melting point. If 18.6 g of this solid requires 4.838 kJ of heat to melt it, what is the molar heat of fusion (in kJ/mol)?

Question

Quizplus · Accepted Answer

The molar heat of fusion is calculated by dividing the heat required to melt the sample by the number of moles of the sample. The number of moles is 18.6 g / 148.0 g/mol = 0.1257 mol. Therefore, the molar heat of fusion is 4.838 kJ / 0.1257 mol = 38.5 kJ/mol, which is closest to 38.4 kJ/mol.

A Solid with a Molecular Weight of 148