Five experiments studied the reaction 2 SO₂ + O₂ → 2 SO₃ in the gas phase.
Exp. | p(SO₂) (atm) | p(O₂) (atm) | Temperature (°C) | V₂O₅ catalyst?
1 | 0.50 | 0.50 | 500 | No
2 | 1.00 | 0.50 | 500 | No
3 | 0.50 | 0.50 | 550 | No
4 | 0.50 | 0.50 | 500 | Yes
5 | 1.00 | 0.50 | 550 | No
Arrange the experiments in order of decreasing initial rate (fastest → slowest). Then, in one sentence, justify the position of Experiment 3 relative to Experiments 2 and 4.