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5 May, 19:23

For the following reaction, it is found that doubling the amount of A causes the reaction rate to quadruple. Doubling the amount of B has absolutely no effect on the rate.

What is the best rate law equation for this reaction?

A + B 2C

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  1. 5 May, 19:26
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    R = k[ A ]²

    Explanation:

    What we are being asked is to determine the exponents in the equation:

    R = k [A ]^a [B]^b

    where R = reaction rate of the chemical reaction, k is the reaction constant, [A ][B] are the concentrations, and a and b are exponents.

    Now the reaction has b = 0 since changing the concentration of B has no effect on the rate.

    So,

    R = k [ A ]^a

    Doubling the amount of A, quadruples the reaction. Therefore a = 2, and the best law equation is R = k[ A ]²
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