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23/01/2022 3:44 pm
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A first order reaction has a rate constant 1.15 10-3 s-1. How long will 5 g of this reactant take to reduce to 3 g?
1 Answer
1
23/01/2022 3:47 pm
From the question, we can write down the following information:
Initial amount = 5 g
Final concentration = 3 g
Rate constant = 1.15 10-3 s-1
We know that for a 1st order reaction,
t = \(\frac{2.303}{k}log \frac{[R]_0}{[R]}\)
= \(\frac{2.303}{1.15 \times 10^{-3}}log \frac{5}{3}\)
= \(\frac{2.303}{1.15 \times 10^{-3}}\)x 0.2219
= 444.38 s
= 444 s (approx)