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Question
A first order reaction has a rate constant 23×10−3 s−1. How long will it take to reduce 5.0 g of the reactant to 3.0 g?
log 2 = 0.3, log 3 = 0.5, log 5 = 0.7.
A first order reaction has a rate constant 23×10−3 s−1. How long will it take to reduce 5.0 g of the reactant to 3.0 g?
log 2 = 0.3, log 3 = 0.5, log 5 = 0.7.
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Solution
The correct option is A 20 seconds
Applying the first order rate equation
k=2.303tloga(a−n)
Where, k = rate constant, a = initial amount of the reactant, a-n = amount of the reactant left after the reaction
t=2.30323×10−3log53≈20 seconds
Applying the first order rate equation
k=2.303tloga(a−n)
Where, k = rate constant, a = initial amount of the reactant, a-n = amount of the reactant left after the reaction
t=2.30323×10−3log53≈20 seconds
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