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Solution


Q.

A first order reaction has a specific reaction rate of 10-2 sec-1. How much time will it take for 20 g of the reactant to reduce to 5 g           [2017]
1 138.6 sec  
2 346.5 sec  
3 693.0 sec  
4 238.6 sec  

Ans.

(1)

For a first order reaction,

k=2.303tlog[A]0[A]t  or  10-2=2.303tlog205

10-2=2.303×0.6020t  or  t=138.6 sec