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The half life of a first-order reaction is 4 years. What is its shelf life (in years)? |
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Answer» ∵ Reaction follow first order kinetics, ∴ t = 1/k ln (N0/Nt) ...(1) Where, t = time k = first order rate constant N0 = initial concentration Nt = after time 't', concentration. After completing first order kinetic reaction — Nt = 0 ∴ from equation (1) t = 1/k ln (N0/0) = 1/k ln (∞) N0/0 → ∞ = 1/k x ∞ ln (∞) → ∞ t = ∞ It mean, first order reaction never completed. Its life will be infinite years. |
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