The rate constant for a first order reaction is 4.606 × 10 – 3 s – 1 . The time required to reduce 2.0 g of…

The rate constant for a first order reaction is 4.606×10–3 s–1. The time required to reduce 2.0 g of the reactant to 0.2 g is :
  1. 200 s
  2. 500 s
  3. 1000 s
  4. 100 s

Solution

k=4.606×10−3s−1

k=2.303tlogC∘Ct

where C∘= initial concentration

Ct= concentration after time t

k=2.303tlog1020.2

4.606×10−3×t=2.303×log10

t=10002=500 s

Asked in: NEET 2020 (Phase 1)

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