CAIE A-Level Chemistry A2 26.1.4 The Numerical Value of a Rate Constant E G Topic Practice

A and B react together to give product AB .

When the concentrations of A and B are both $0.0100 \mathrm{moldm}^{-3}$, the rate of formation of AB is $7.62 \times 10^{-4} \mathrm{moldm}^{-3} \mathrm{~s}^{-1}$. When the concentrations of A and B are both $0.0200 \mathrm{moldm}^{-3}$, the rate of formation of AB is $3.05 \times 10^{-3} \mathrm{moldm}^{-3} \mathrm{~s}^{-1}$.

Choose one of the rate equations you have written in (i), and calculate the value of the rate constant, k. Include the units of k.
k= units