The rate constant for the second-order reaction 2 NOBr(g) —> 2 NO (g) + Br₂(g)

is 0.80/M.s at 10°C. (a) Starting with a concentration of 0.086 M, calculate the concentration of NOBr after 22 s. (b) Calculate the half-lives when [NOBr]₀= 0.072 M and [NOBr]o = 0.054 M

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