Question

The rate law for a hypothetical reaction is rate = k [A]2. When the concentration is 0.10 moles/liter, the rate is 2.7 × 10-5 M*s-1. What is the value of k? A. 2.7 × 10-3 B. 2.7 × 10-3 M-1s-1 C. 7.2 × 105 M-1s-1 D. 2.7 × 10-4 M-1s-1

Answer 1

Rate = k[A]^2
2.7 x 10^-5 = k[0.10]^2
k = 2.7 x 10^-5 / 0.01 = 2.7 x 10^-3

The correct answer is option B.