Question
For the reaction, $$2A + B \to 3C + D$$ which of the following does not express the reaction rate?
A.
$$ - \frac{{d\left[ C \right]}}{{3dt}}$$
B.
$$ - \frac{{d\left[ B \right]}}{{dt}}$$
C.
$$\frac{{d\left[ D \right]}}{{dt}}$$
D.
$$ - \frac{{d\left[ A \right]}}{{2dt}}$$
Answer :
$$ - \frac{{d\left[ C \right]}}{{3dt}}$$
Solution :
For the reaction,
$$2A + B \to 3C + D$$
The reaction rate is written as follows :
The reaction rate with respect to $$A = - \frac{1}{2}\frac{{d\left[ A \right]}}{{dt}}$$
The reaction rate with respect to $$B = - \frac{{d\left[ B \right]}}{{dt}}$$
The reaction rate with respect to $$C = + \frac{1}{3}\frac{{d\left[ C \right]}}{{dt}}$$
The reaction rate with respect to $$D = \frac{{d\left[ D \right]}}{{dt}}$$
Hence, the answer (A) is not correct expression to represent the rate of the reaction.