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Question
A first order reaction has a rate constant of 10−2sec−1. How long will it take for a 20 g sample to become 5 g?
- 138.6
- 138.6
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Solution
The correct option is A 138.6
k = 10−2 = 0.693t12
t12= 0.69310−2
t12= 69.3 seconds
It takes two half lives for 20 g to reduce to 5 g,
therefore, the time required = 2×69.3
=138.6 seconds
k = 10−2 = 0.693t12
t12= 0.69310−2
t12= 69.3 seconds
It takes two half lives for 20 g to reduce to 5 g,
therefore, the time required = 2×69.3
=138.6 seconds
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