Question

For the given reaction: $2A+B\to 3C+D$.
Which of the following expression(s) is/are correct regarding overall rate of reaction $\left(r\right)$?

• A. $r=-\frac{1}{3}\times \frac{d\left[C\right]}{dt}$
• B. $r=-\frac{d\left[B\right]}{dt}$
• C. $r=\frac{d\left[D\right]}{dt}$
• D. $r=-\frac{1}{2}\frac{d\left[A\right]}{dt}$

Answer 1

Answer: (B), (C), (D)

$r=-\frac{1}{2}\frac{d\left[A\right]}{dt}$

For the reaction:
$2A+B\to 3C+D$
Overall rate $r$ can be expressed as:
$r=\frac{-1}{2}\times \frac{d\left[A\right]}{dt}=-\frac{d\left[B\right]}{dt}=\frac{+1}{3}\times \frac{d\left[C\right]}{dt}=\frac{d\left[D\right]}{dt}$

Correct options are (b), (c), (d)