calculate the energy released in kj by freezing 13.8g of a liquid. Its molar mass is 82.9 g/mol and its molar enthalpy of fusion is 4.60 kj/mol

Question

Please provide the process and the answer!

Answer 1

When you freeze something, heat is released from the liquid and the amount of heat released is dependent on the enthalpy of fusion for that material and the mass of material being frozen.

You use the formula q = m∆H_fusion where q = heat; m = mass and ∆H_fusion = enthalpy of fusion

q = ?

m = 13.8 g x 1 mol / 82.9 g = 0.166 mols

∆Hfusion = 4.60 kJ / mol

q = (0.166 mols)(4.60 kJ/mol)

q = 0.764 kJ of heat energy released