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A & B are undergoing first order rxn with rate constant K1 & K2 which are in the ratio 3:2. If initial concentration of A & B are in ratio 3:2, what would be ratio of [A] & [B] after three half lifes of A ?

A & B are undergoing first order rxn with rate constant K1 & K2 which are in the ratio 3:2. If initial concentration of A & B are in ratio 3:2, what would be ratio of [A] & [B] after three half lifes of A ?

Grade:12th pass

2 Answers

Gopesh Kumar IIT Roorkee
askIITians Faculty 11 Points
9 years ago
k_1=1.5\times k_2
So, T_{1/2}\left ( 1 \right )=(2/3)T_{1/2}\left ( 2 \right ) Therefore, 3T_{1/2}\left ( 1 \right )=2T_{1/2}\left ( 2 \right ) Hence, [B]=0.25[B]_{0} and [A]=0.125[A]_{0} Calculating the ratio, we get, the answer as 3:4.
Arpit Dhankar
33 Points
9 years ago
thank u sir!

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