Latent Heats: A substance has a melting point of 20°C and a heat of fusion of 3.6 × 104 J/kg. The boiling point is 150°C and the heat of vaporization is 7.2 × 104 J/kg at a pressure of one atmosphere. The specific heats for the solid, liquid, and gaseous phases are 600 J/kg ? K (solid), 1000 J/kg ? K (liquid), and 400 J/kg ? K (gaseous). How much heat is given up by 2.80 kg of this substance when it is cooled from 170°C to 86°C at a pressure of one atmosphere?
A. 400 kJ
B. 200 kJ
C. 300 kJ
D. 440 kJ
E. 640 kJ
Answer: A
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