Calculate the heat change in joules for freezing 235 g of water at 0 ∘C.

Question

Express your answer as a positive value using three significant figures and include the appropriate units.

Answer 1

The ∆H_fusion for water = 334 J/g

235 g x 334 J/g = 78,490 J = 78,500 joules = 78.5 kJ (to 3 significant figures)