How much heat is released when 25.0 grams of liquid copper at its freezing point of 1,085°C changes to solid? The latent heat of fusion of copper is 205.0 J/g.
Answer
A
–27,130 J
B
–5,130 J
C
5,130 J
D
27,130 J
Explanation
Use q = mL_f: (25.0 g)(205.0 J/g) = 5,125 J, which rounds to 5,130 J. Freezing releases heat, so the heat change is negative: –5,130 J. The correct choice is B, –5,130 J.
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