The instantaneous reaction rate of a hypothetical elementary irreversible chemical reaction abruptly — Chemical Kinetics Chemistry Question

💡 Solution & Explanation

Assume the rate law is $\text{Rate}_1 = k[A]^n$. When the concentration is tripled to $3[A]$, the new rate is $\text{Rate}_2 = k(3[A])^n = 3^n \times k[A]^n = 3^n \times \text{Rate}_1$. The problem specifies that $\text{Rate}_2 = 27 \times \text{Rate}_1$. Therefore, $3^n = 27$, which yields an integer order $n = 3$.