Page 32 - FINAL DBS10012_HEAT TEMPERATURE 20102022 (2) (1)

EXERCISE 6.3

1. Calculate the amount of heat added to 1-gram gold to change phase from solid to liquid. Heat of
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fusion for gold is 64.5 x 10 J/kg.

Answer: 64.5 J

2. Calculate the amount of heat released by 1-gram mercury to change phase from liquid to solid.

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Heat of fusion for mercury is 11.8 x 10 J/kg.
Answer: 11.8 J

3. Determine the amount of heat absorbed by 1 kg water to change phase from liquid to vapor
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(steam). Heat of vaporization for water = 2256 x 10 J/kg.
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Answer: 2256 x 10 J

4. Determine the amount of heat released by nitrogen to change phase from vapor to liquid. Heat of

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vaporization for nitrogen = 200 x 10 J/kg.
Answer: 200 J

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5. How much thermal energy is required to change a 40 g ice cube from a solid at -10 C to steam at
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110 C.
Answer: 122.284 kJ

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