Which of the following has the highest heat of vaporization?
Correct answer: C. Water
- A. Nitrogen gas
- B. Ethene
- C. Water
- D. All have the same heat of vaporization
Explanation
The heat of vaporization is defined as the amount of heat required to convert 1g of a liquid into vapors, without any change in temperature. The heat of vaporization depends on the intermolecular forces in a substance. Water molecules have a strong hydrogen bonding, which accounts for their high heat of vaporization at 40.8 kJ/mol.Ethene (ethylene) and nitrogen have heats of vaporization of 13.5 kJ/mole and 2.79 kJ/mol respectively.
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About Thermochemistry and Energetics of Chemical Reactions
Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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