The decomposition of NO2(g) is second order with k = 0.75 M-1s-1 at a given temperature and when 0.400 mol of NO2 initially are placed in a 5.00 L container. 2 NO2  → O2 + 2 NO What is the concentration (in M) of O2(g) at the same temperature after 7.0 minutes have elapsed? Enter your answer with two significant figures without units. Correct!

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