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A first order reaction has specific rate...

A first order reaction has specific rate of `10^(-2)s^(-1)`. How much time will it take for 20 g of the reactant to reduce to 5 g?

A

238.6 s

B

138.6s

C

346.5 s

D

693.0s

Text Solution

Verified by Experts

The correct Answer is:
B
b) For first order reaction,
`k=2.303/t log [A]_(0)/[A]_(t)`
`t=2.303/k log ([A]_(0))/([A]_(t))`
`t=2.303/(10^(-2)s^(-1)) log ([20])/([5])`
`t=2.303 xx 0.0620 xx (100 s) = 138.6s`
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