Question

For the reaction, 2A + B ¾® 3C + D; which of the following does not express the reaction rate –

• A. $\frac{d\lbrack D\rbrack}{dt}$
• B. $\frac{- d\lbrack A\rbrack}{2dt}$
• C. –$\frac{d\lbrack C\rbrack}{3dt}$
• D. –$\frac{d\lbrack B\rbrack}{dt}$

Answer 1

Answer: (C)

–$\frac{d\lbrack C\rbrack}{3dt}$

Answer 2

2A + B ¾® 3C + D

\ r_reaction = $\frac{1}{2}$× $\left( - \frac{dA}{dt} \right)$= – $\frac{dB}{dt}$=$\frac{1}{3}$×$\left( + \frac{dC}{dt} \right)$

= $\frac{1}{1}$×$\left( + \frac{dD}{dt} \right)$

\ r_reaction ¹ –$\frac{d(C)}{3dt}$