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1. A certain reaction is first order. After 540 min., 67.5 % of the reactant is decomposed. Determine t when 25 % of the reactant

1. A certain reaction is first order. After 540 min., 67.5 % of the reactant is decomposed. Determine t when 25 % of the reactant has decomposed.

2. What is the half life of the zero order reaction if the value of initial concentration is 2.67 M and the value of rate constant is 5.82 x 10^-3.

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