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The enthalpy of vaporization of a substance is defined as:

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Question: The enthalpy of vaporization of a substance is defined as:

Options:

  1. The heat required to melt the substance
  2. The heat required to convert a liquid into a gas
  3. The heat released during condensation
  4. The heat required to raise the temperature of a substance

Correct Answer: The heat required to convert a liquid into a gas

Solution: 

The enthalpy of vaporization is the heat required to convert a liquid into a gas at constant temperature and pressure.

The enthalpy of vaporization of a substance is defined as:

Practice Questions

Q1
The enthalpy of vaporization of a substance is defined as:
  1. The heat required to melt the substance
  2. The heat required to convert a liquid into a gas
  3. The heat released during condensation
  4. The heat required to raise the temperature of a substance

Questions & Step-by-Step Solutions

The enthalpy of vaporization of a substance is defined as:
  • Step 1: Understand that enthalpy of vaporization is a measure of energy.
  • Step 2: Recognize that it refers to the heat needed to change a liquid into a gas.
  • Step 3: Note that this change happens at a constant temperature and pressure.
  • Step 4: Remember that this process is called vaporization or boiling.
  • Enthalpy of Vaporization – The amount of heat needed to transform a liquid into a gas at constant temperature and pressure.
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