For the irreversible process, A+B→products, the rate is first-order with respect to A and second-order with respect to B. If 1.0 mol each of A and B introduced into a 1.0 L vessel, and the initial rate was 1.0×10−2 mol L−1s−1, rate when half reactants have been turned into products is :

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1.25×10−3 mol L−1s−1

1.0×10−2 mol L−1s−1

2.50×10−3 mol L−1s−1

2.0×10−2 mol L−1s−1

answer is A.

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Detailed Solution

A+B→productr=K[A]1[B]2r1=K[1]1[1]2=1×10−2(K=1×10−2)r1=K[12][12]2=1×10−2×18=1.25×10−3 mol L−1S−1

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