A + BP Experiment # [A] (M) [B] (M) Initial rate (M/s) 1 0.273 0.763 2.83 2 0.27

Question

A + BP

Experiment # [A] (M) [B] (M) Initial rate (M/s) 1 0.273 0.763 2.83 2 0.273 1.526 2.83 3 0.819 0.763 25.47

Explanation / Answer

we know that the rate of reaction say aA+ bB -> products is dependent on the reactants given by:  k[A]m[B]n where k is rate constant now order of the reaction is equal to (m+n). the powers i.e m , n have no relation with the stoichiometriccoefficients a and b . so here in this problem: A+ B -> P suppose rate of reaction is = k[A]m[B]n then studying from the table we see at first data concentration ofA and B is given and initial rate is also given. at the second data when the concentration of A is kept the same andB doubled there is no change in rate of reaction that means the rate of reaction does not depend on conc of B so n =0 now at third data when conc of A is tripled then the rate becomes 9times of the initial. that means m =2 so that there is 9 times increase in rate when concof A is increased 3 times. so m = 3 and n = 0 so the exponents of A is 3 and that of B is0

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