Question

$A\left(g\right)\to B\left(g\right)$
For the above reaction involving gaseous reactants and gaseous products, the concentration is expressed in terms of pressure. Then the unit of rate of reaction will be:

• A. $atm$
• B. $atm.s$
• C. $at{m}^2.s$
• D. $atm{s}^{-1}$

Answer 1

The correct option is D $atm{s}^{-1}$

Rate of a chemical reaction:
The rate of change of concentration with time of different chemical species taking part in a chemical reaction isknown as rate of reaction w.r.t that species
$\text{Rate}=\frac{\Delta C}{\Delta t}$
Here,
$\Delta C=\text{Change in concentration of any species}$
$\Delta t=\text{Time change corresponding to the concentration change}$
$\text{Unit of rate}=\frac{\text{Unit of}\Delta C}{\text{Unit of}\Delta t}$

Here concentration is expressed in terms of pressure. So unit of change in pressure will be atm.
$\text{Unit of rate}=\frac{atm}{s}=atm{s}^{-1}$