Ncert Exercises & Solutions

4.1: 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.

= - \frac{∆ [R]}{∆ t}

= - \frac{{[R]}_{2} [R]}{t_{2} - t_{1}}

= - \frac{0.02 - 0.03}{25} M m i n^{- 1}

= - \frac{- 0.01}{25} M m i n^{- 1}

= 4 \times 10^{- 4} M m i n^{- 1}

= \frac{4 \times 10^{- 4}}{60} M s^{- 1}

= 6.67 \times 10^{- 6} M s^{- 1}

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