Question

For the reaction \[\ce{R -> P}\], 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

In units of minute,

Average rate = `-(Δ["R"])/(Δ"t")`

= `-(["R"_2] - ["R"_1])/("t"_2 - "t"_1)`

= `-(0.02 - 0.03)/25`

= `-((-0.01))/25`

= 4 × 10⁻⁴ M min⁻¹

In units of second,

Average rate = `-(Δ["R"])/(Δ"t")`

= `-((-0.01))/(25 xx 60)`

= 6.66 × 10⁻⁶ M s⁻¹