For the first order reaction \( \mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}(\mathrm{g}) \rightarrow...

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For the first order reaction
\( \mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}(\mathrm{g}) \rightarrow \mathrm{CH}_{4}(\mathrm{~g})+\mathrm{CO}(\mathrm{g}) \), the initial pressure of \( \mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O}(\mathrm{g}) \) is 80 torr and total pressure at the end of 20 minutes is 120 torr. The time needed for \( 75 \% \) decomposition of \( \mathrm{C}_{2} \mathrm{H}_{4} \mathrm{O} \) would be :
(a) 20 minutes
(b) 40 minutes
(c) 80 minutes
(d) 120 minutes
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