Question:medium

Prove that in case of first order reaction t₉₉.₉% = 10 t₁/₂

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A useful shortcut for first-order reactions: t₉₀% ≈ 3.33 t₁/₂, t₉₉% ≈ 2 × t₉₀%, and t₉₉.₉% ≈ 3 × t₉₀%. Since 10ⁿ = n, the time for "n-nines" completion increases linearly.
Updated On: Mar 13, 2026
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