Discussion
Steam condenses at 100 degrees Celsius with a latent heat of 2257 kilojoules per kilogram. How much heat is released by condensing 2 kilograms?
Answer: A
Correct answer: 4514 kilojoules
\[ 2 \times 2257 = 4514\ \mathrm{kJ}. \] The latent heat is per kilogram, so it multiplies by the mass. Note the magnitude against the previous item: condensing two kilograms of steam releases four and a half times the heat needed to warm ten kilograms of liquid through forty degrees, which is why latent heat dominates any balance in which a phase change occurs.
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