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Which of the following reactions has a positive ΔG at standard conditions?

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Question: Which of the following reactions has a positive ΔG at standard conditions?

Options:

  1. Combustion of glucose
  2. Formation of water from hydrogen and oxygen
  3. Dissolution of salt in water
  4. Decomposition of hydrogen peroxide

Correct Answer: Decomposition of hydrogen peroxide

Solution: 

The decomposition of hydrogen peroxide is non-spontaneous under standard conditions, resulting in a positive ΔG.

Which of the following reactions has a positive ΔG at standard conditions?

Practice Questions

Q1
Which of the following reactions has a positive ΔG at standard conditions?
  1. Combustion of glucose
  2. Formation of water from hydrogen and oxygen
  3. Dissolution of salt in water
  4. Decomposition of hydrogen peroxide

Questions & Step-by-Step Solutions

Which of the following reactions has a positive ΔG at standard conditions?
Correct Answer: Decomposition of hydrogen peroxide
  • Step 1: Understand what ΔG means. ΔG is the change in free energy of a reaction.
  • Step 2: Know that a positive ΔG indicates a non-spontaneous reaction under standard conditions.
  • Step 3: Identify the reaction in question, which is the decomposition of hydrogen peroxide (H2O2).
  • Step 4: Recognize that the decomposition of hydrogen peroxide does not occur spontaneously under standard conditions.
  • Step 5: Conclude that since the reaction is non-spontaneous, it has a positive ΔG.
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