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

Question

A first-order reaction has a specific reaction rate 10 - 2 sec - 1 ⁡ . How much time will it take for 20 g the reactant to reduce to 5 g ?, 238 . 6 second, 138 . 6 second, 346 . 5 second, 693 . 0 second

MARKS App · Accepted Answer

t 1 2 = 0 .693 10 - 2 second For the reduction of 20 g of reactant to 5 g , two t 1 2 is required. ∴ t = 2 × 0 .693 10 - 2 second = 138.6 s e c o n d

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