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For a reaction of A 6 B + C it takes 100 seconds for the concentration...

For a reaction of A 6 B + C it takes 100 seconds for the concentration of A to decrease from 0.100 M to 0.050 M and then another 200 seconds to decrease to 0.025 M. What is the value of the rate constant?   

(a) 0.100 M-1-s-1 (b) 6.93x10-3 s-1 (c) 3.46x10-3 s-1(d) 10.0 M-1-s-1 (e) 144 s-1

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Answer #1

As the given reaction is first order and in 100 seconds its concentration becomes half , and as we know the time in which concentration becomes half is known as half life time . So half life time of reaction is 100 seconds.

Now,

So , option " b" is correct

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