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Concentration left after a given time from the half-life and initial concentration

The same question, asked 2 times: 11 Apr 2026 S2*, 19 Apr 2026 S2. Every wording below, oldest first.

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  1. Question 1

    11 Apr 2026 S2

    27
    The half life of first order reaction is 850850 s. The initial concentration of the reactant is 0.06 mol dm−30.06\ \mathrm{mol\,dm^{-3}}. What concentration would remain after 12001200 s ?

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  2. Question 2

    19 Apr 2026 S2

    31
    Half life of a first order reaction is 900900 second. If initial concentration of reactant is 0.08 mol dm−30.08\ \mathrm{mol\,dm^{-3}} find concentration that remains after 3535 minute ?

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