During a reaction involving gases, the combined volume of the gaseous reactants can be different from the combined volume of the gaseous products. Which reaction gives the largest percentage change in gas volume? (Assume each reaction goes to completion.)
- A$2\text{SO}_2(g) + \text{O}_2(g) \rightarrow 2\text{SO}_3(g)$
- B$\text{CH}_4(g) + 2\text{O}_2(g) \rightarrow \text{CO}_2(g) + 2\text{H}_2\text{O}(g)$
- C$\text{N}_2(g) + 3\text{H}_2(g) \rightarrow 2\text{NH}_3(g)$
- D$2\text{C}_2\text{H}_6(g) + 7\text{O}_2(g) \rightarrow 6\text{H}_2\text{O}(g) + 4\text{CO}_2(g)$