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NCERT Class XII Chemistry
Chapter - Chemical Kinetics
Questions with Solutions

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Question : 31 of 39
Marks: +1, -0
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.
Solution:  
units of minute,
Average rate =−Δ[R]Δt= -\frac{\Delta[R]}{\Delta t}
=−[R]2−[R]1t2−t1= -\frac{[R]_{2}-[R]_{1}}{t_{2}-t_{1}}
=−0.02−0.0325=−−0.0125= -\frac{0.02-0.03}{25} = -\frac{-0.01}{25}
=4×10−4Mmin−1=4 \times 10^{-4} \text{M} \text{min}^{-1}
In units of second,
Average rate =−Δ[R]Δt= -\frac{\Delta[R]}{\Delta t}
=−0.0125×60= -\frac{0.01}{25 \times 60}
=6.66×10−6Ms−1=6.66 \times 10^{-6} \text{Ms}^{-1}
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