Question

Under certain conditions, the average rate of appearance of oxygen gas in the reaction: $2O_3\left(g\right)⟶3O_2\left(g\right)$ is 6.0 torr sec${}^{-1}$. What is average rate expressed in units of torr sec${}^{-1}$ for the disappearance of $O_3$?

• A. 9
• B. 6
• C. 4
• D. 3

Answer 1

The correct option is C 4

$Rate=-\frac{1}{2}\frac{\Delta \left[O_3\right]}{\Delta t}=\frac{1}{3}\frac{\Delta \left[O_2\right]}{\Delta t}-\frac{\Delta \left[O_3\right]}{\Delta t}=\frac{2}{3}\frac{\Delta \left[O_2\right]}{\Delta t}=\frac{2}{3}\ast \left(6torr{sec}^{-1}\right)=4torr{sec}^{-1}$