Question

For the following homogeneous reaction, the unit of rate constant is: $A+B\stackrel{k}{\to }C$

• A. $mo{l}^{-1}L{s}^{-1}$
• B. $s^{-1}$
• C. $s$
• D. $s^{-1}mol{L}^{-1}$

Answer 1

Answer: (A)

For the homogenous gaseous reaction,
$A+B\stackrel{k}{\to }C$, the rate law is
$\frac{dx}{dt}=k[A][B]$
or $k=\frac{dx}{dt\times [A][B]}$
$=\frac{mol{L}^{-1}}{\text{ time }\times mol{L}^{-1}\times mol{L}^{-1}}$
or unit of rate constant k is $mo{l}^{-1}Ltim{e}^{-1}$ or $mo{l}^{-1}L{s}^{-1}$