Consider a certain reaction A → Products with k = 2.0 × 10⁻²s⁻¹. Calculate the concentration of A remaining after 100 s if the initial concentration of A is 1.0 mol L⁻¹.

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Solution

k = 2.0 × 10⁻² s⁻¹

T = 100 s

[A]_o = 1.0 moL⁻¹

Since the unit of k is s⁻¹, the given reaction is a first order reaction.

Therefore,

= 0.135 mol L⁻¹ (approximately)

Hence, the remaining concentration of A is 0.135 mol L⁻¹.

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