The decomposition of XY is second order in XY and has a rate constant of 7.00×10−3 L mol−1 s−1 at a certain temperature. A) How long will it take for the concentration of XY to decrease to 10% of its initial concentration when the initial concentration is 0.100 mol L−1? Express your answer using two significant figures. B) How long will it take for the concentration of XY to decrease to 10% of its initial concentration when the initial concentration is 0.200 mol L−1? Express your answer using three significant figures. C) If the initial concentration of XY is 0.140 mol L−1 , how long will it take for the concentration to decrease to 6.80×10−2 mol L−1? Express your answer using two significant figures.

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