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Question

For the elementary reaction MN, the rate of disappearance of M increases by a factor of 8 upon doubling the concentration of M. The order of the reaction with respect to M is 


Solution

Rate[M]n

Rate=k[M]n......(i)

When we double the concentration of [M], rate becomes 8 times, hence new rate law can be written as

8×Rate=k[2M]n......(ii)

Rate8×Rate=k[M]nk[2M]n

18=12n

2n=8n=3

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