# A first order reaction has a specific reaction rate of 10^−2sec^−1. How much time will it take for 20 g of the reactant

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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?

(a) 138.6 sec

(b) 346.5 sec

(c) 693.0 sec

(d) 238.6 sec