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Which of the following processes has a negative ΔG?

Practice Questions

Q1
Which of the following processes has a negative ΔG?
  1. Melting of ice at 0°C.
  2. Freezing of water at 0°C.
  3. Dissolving salt in water.
  4. Sublimation of dry ice.

Questions & Step-by-Step Solutions

Which of the following processes has a negative ΔG?
  • Step 1: Understand what ΔG means. ΔG is the change in free energy of a process.
  • Step 2: Know that a negative ΔG indicates a spontaneous process, meaning it can happen without needing extra energy.
  • Step 3: Consider the example of dissolving salt in water. This process occurs naturally when salt is added to water.
  • Step 4: Recognize that when salt dissolves, it releases energy and increases disorder (entropy), which contributes to a negative ΔG.
  • Step 5: Conclude that since dissolving salt in water is spontaneous, it has a negative ΔG.
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