Which of the following is a unit of heat of vaporization?
Correct answer: D. Calories/gram
- A. Calorie
- B. Kilojoule
- C. Joule
- D. Calories/gram
Explanation
The heat of vaporization (ΔHv) is defined as the energy (Q) required to vaporize 1g of a liquid without any change in its temperature. The heat of vaporization formula is:ΔHv = Q/mOf all the given options, only 'calories per gram' fits this definition. Calories, joules, and kilojoules are units of energy.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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