A first-order reaction has a specific reaction rate 10 - 2 sec - 1 ⁡ . How much time will it take for 20 g…

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

Solution

t12=0.69310-2 second
For the reduction of 20 g of reactant to 5 g, two t12 is required.
∴    t=2×0.69310-2 second
=138.6 second

Asked in: NEET 2017

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