The reaction X+Y arrow Z is first order with respect to X and...

The reaction $\mathrm{X}+\mathrm{Y} \rightarrow \mathrm{Z}$ is first order with respect to X and second order with respect to Y . The initial rate of formation of $\mathrm{Z}=\mathrm{R} \mathrm{mol}^{-} \mathrm{dm}^3 \mathrm\sec^{-1}$ when $[\mathrm{X}]_0$ and $[\mathrm{Y}]_0$ are $0.40 \mathrm{~mol} \mathrm{dm}^{-3}$ and $0 . \mathrm{mol} \mathrm{dm}{ }^{-3}$ respectively. If $[X]_0$ is halved and $[Y]_0$ is doubled, the value of the initial rate would become