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What is the enthalpy change when 1 mole of water vapor condenses to liquid water

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Question: What is the enthalpy change when 1 mole of water vapor condenses to liquid water?

Options:

  1. It is positive.
  2. It is negative.
  3. It is zero.
  4. It is dependent on pressure.

Correct Answer: It is negative.

Solution: 

The condensation of water vapor to liquid water releases heat, making the enthalpy change negative.

What is the enthalpy change when 1 mole of water vapor condenses to liquid water

Practice Questions

Q1
What is the enthalpy change when 1 mole of water vapor condenses to liquid water?
  1. It is positive.
  2. It is negative.
  3. It is zero.
  4. It is dependent on pressure.

Questions & Step-by-Step Solutions

What is the enthalpy change when 1 mole of water vapor condenses to liquid water?
Correct Answer: -40.79 kJ/mol
  • Step 1: Understand that enthalpy change refers to the heat energy change during a process.
  • Step 2: Identify the process: condensing water vapor (gas) into liquid water.
  • Step 3: Recognize that condensation is an exothermic process, meaning it releases heat.
  • Step 4: Conclude that since heat is released, the enthalpy change will be negative.
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