Chemistry - Chemical Kinetics - Order of reaction - Integrated Rate Laws

3 examples using integrated rate laws. Example 1 (First Order): 'A first-order reaction has k=0.05 s⁻¹. [A]₀=1.0 M. Find [A] after 20s.' Formula: ln[A] = ln[A]₀ - kt. ln[A] = ln(1.0) - (0.05)(20) = 0 - 1 = -1. [A] = e⁻¹ = 0.368 M. Also: t½ = 0.693/k = 0.693/0.05 = 13.9 s. Example 2 (First Order half