Within the Contact process, sulfur dioxide is changed into sulfur trioxide. $2\text{SO}_2(g) + \text{O}_2(g) \rightleftharpoons 2\text{SO}_3(g)$. What effect does a decrease in pressure have on the rate at which sulfur trioxide forms and on the percentage yield of sulfur trioxide at equilibrium?
- Arate of formation decreases, percentage yield decreases
- Brate of formation decreases, percentage yield increases
- Crate of formation increases, percentage yield decreases
- Drate of formation increases, percentage yield increases