Question

1) For the reaction $R⟶P$,the concentration of a reactant changes from 0.03M to 0.02M in 25 minutes. Calculate the average rate of reaction using units of time both in minutes and seconds.
2) In a reaction, $2A⟶Products$, the concentration of $A$ decreases from $0.5$ to $0.4mol{L}^{-1}$ in 10 minutes. Calculate the rate during this interval.

Answer 1

(1) Average rate (in M/min)= $\left|\frac{\Delta R}{\Delta t}\right|$

$=\left|\frac{0.03-0.02}{25}\right|$

$=4\times {10}^{-4}M/min$

Average rate (in M/sec)= $\frac{0.03-0.02}{25\times 60}$

$=6.67\times {10}^{-6}M/sec$

(2) Rate during given interval= $\frac{\Delta A}{\Delta t}$

$=\frac{(0.5-0.4)}{10}$

$={10}^{-2}mol{L}^{-1}mi{n}^{-1}$