The decomposition of ethylene oxide at 690 K is monitored by measuring the total gas pressure as

Question:

The decomposition of ethylene oxide at 690 K is monitored by measuring the total gas pressure as a function of time. The data obtained are t = 10 min, Ptot = 139.14 mmHg; 20 min, 151.67 mmHg; 40 min, 172.65 mmHg; 60 min, 189.15 mmHg; 100 min, 212.34 mmHg; 200 min, 238.66 mmHg; ∞ 249.88 mmHg. What is the order of the reaction (CH₂)₂O(g) → CH₄(g) + CO(g)?

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