Question

What is the heat required to melt 77.4 g of solid diethyl ether, (C₂H₅)₂O, at its melting point? The ΔH° of fusion of diethyl ether is 7.66 kJ/mol. Use a molar mass with at least as many significant figures as the data given.

 Answer in kJ Units

Answer 1

$Moles =\frac{ 77.4 g }{74.14 g/mol }= 1.044 mol$

$∆H°= 1.044 mol × 7.66 kJ/mol = 7.997 kJ$