Chapter 20, Problem 81IAE

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, $P_{\text{col}}=139.14$ mmHg; 20 min, 151.67 mmHg; 40 min, 172.65 mmHg; 60 min, 189.15 mmHg; 100 min, 212.34mmHg; 200 min, 238.66 mmHg; $\infty$ , 249.88 mmHg. What is the order of the reaction ${\left({\text{CH}}_{\text{2}}\right)}_{\text{2}}\text{O}\left(\text{g}\right)\to {\text{CH}}_{\text{4}}\left(g\right)+\text{CO}\left(\text{g}\right)$ ?