For a first order reaction A → B the reaction rate at reactant concentration of 0.01 M is found to be 2.0 × 10⁻⁵ mol L⁻¹ s⁻¹. The half life period of the reaction is

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347 s. For a first-order reaction, rate = k[A]. Here, k = rate/[A] = (2.0 × 10⁻⁵)/(0.01) = 2.0 × 10⁻³ s⁻¹. The half-life for a first-order reaction is t₁/₂ = 0.693/k = 0.693/(2.0 × 10⁻³) = 347 s.

For a first order reaction A → B the reaction rate at reactant concentration of 0.01 M is found to be 2.0 × 10⁻⁵ mol L⁻¹ s⁻¹. The half life period of the reaction is

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