Question Detail
Question
For the reaction 3A + B → 2C, the rate law is rate = k[A]²[B]. If [A] is tripled and [B] is halved, the rate will change by a factor of:
Correct Answer
Option B is the correct answer.
Detailed Explanation
Initial rate = k[A]²[B]. New rate = k[3A]²[½B] = k × 9 × ½ × [A]²[B] = 4.5 × k[A]²[B]. Factor = 4.5.
Hint
Factor for A² is 3² = 9; factor for B is 0.5; overall factor = 9 × 0.5 = 4.5.