Question

In the reaction, $H_2 + I_2 \rightarrow 2HI, $ what is the rate of appearance of $HI$, if rate of disappearance of $H_2$ is $10^{-6} mol\, L^{-1}\, s^{-1} $?

• A. $10^{-6}\, mol\, L^{-1}\, s^{-1} $
• B. $2 \times 10^{-6} \,mol \,L ^{-1} s ^{-1}$
• C. $0.5 \times 10^{-6} mol\, L ^{-1} s ^{-1}$
• D. $10^{-7} mol \,L ^{-1} s ^{-1}$

Answer 1

Answer: (B)

$-\frac{d\left[H_{2}\right]}{dt} =\frac{1}{2} \frac{d\left[HI\right]}{dt}$
$-\frac{d\left[HI\right]}{dt} =2\times10^{-6} mol^{ }L^{-1} s^{-1}$