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In which of the following equilibria will increasing the container volume shift the position toward the products?

1. 2 NO2(g) <-> 2 NO(g) + O2(g)
2. 3 O2(g) <-> 2 O3(g)
3. H2(g) + I2(g) <-> 2 HI(g)
4. 4 NH3(g) + 5 O2(g) <-> 4 NO(g) + 6 H2O(l)

Correct answer: 2 NO2(g) <-> 2 NO(g) + O2(g)

Solution

Forward formation of products is favoured by larger volume only when products have more gas moles; 2 NO2 -> 2 NO + O2 goes from 2 to 3 gas moles.

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