What is the rate law expression for the reaction? — Chemical Kinetics Chemistry Question

💡 Solution & Explanation

Comparing Exp 1 & 2: [H2S] is constant, [OH] triples (from 1.3 to 3.9), and the rate triples (1.4 to 4.2). Thus, order wrt OH is 1. Comparing Exp 2 & 3: [OH] is constant, [H2S] doubles (from 2.1 to 4.2), and the rate doubles (4.2 to 8.4). Thus, order wrt H2S is 1. Overall rate = K[OH][H2S]. Therefore, correct answer is D.