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When iron is exposed to moisture and it rusts, the value of ΔG for the...

Chemistry
JAMB 2005

When iron is exposed to moisture and it rusts, the value of ΔG for the reaction is

  • A. neutral
  • B. zero
  • C. positive
  • D. negative
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Correct Answer: Option D
Explanation

The rusting of iron is a spontaneous reaction, meaning it occurs naturally without external energy input, as iron oxidizes to form rust (iron oxide) when exposed to oxygen and moisture. Although, it is a slow process, but  there is an increase in entropy (ΔS) as well as the emission of heat which makes it a spontaneous reaction as the resulting change in Gibbs free energy will be negative.i.e ΔG = - ve

There is an explanation video available below.


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Explanation Video

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