Question

For the reaction R → P, the concentration of a reactant changes from 0.03 M to 0.02 M in 25 minutes. Calculate the average rate of reaction using units of time both in minutes and seconds.​

Answer 1

Given :-

• Initial concentration of the reactant = 0.03 M.
• Final concentration of the reactant = 0.02 M.
• Time taken, Δt = 25 min.

To Find :-

• Average rate of the reaction using minutes and seconds as units of time.

Solution :-

Case I (time in minutes):-

Rate = $\rm{-\dfrac{{\Delta}[R]}{{\Delta}t}}$

Putting the values, we get,

$\implies\rm{\dfrac{-(0.02-0.03)\:mol\:L^{-1}}{25\:min}}$

$\implies\rm{\dfrac{0.01\:mol\:L^{-1}}{25\:min}}$

$\implies\bold{4\times{}10^{-4}\:mol\:L^{-1}\:min^{-1}.}$

$\hrulefill$

Case II (time in seconds):-

Time taken = 25 min = 25 × 60 s

Again, Rate = $\rm{-\dfrac{{\Delta}[R]}{{\Delta}t}}$

Putting the values, we get,

$\implies\rm{\dfrac{-(0.02-0.03)\:mol\:L^{-1}}{25\times{}60\:s}}$

$\implies\rm{\dfrac{0.01\:mol\:L^{-1}}{25\times{}60\:s}}$

$\implies\bold{6.67\times{}10^{-6}\:mol\:L^{-1}\:s^{-1}.}$

Answer 2

Answer:

Hope this helps.