Question Detail
Question
For the reaction X + Y → Z, the rate law is rate = k[X]²[Y]. If [X] is doubled and [Y] is tripled, the rate changes by a factor of:
Correct Answer
Option B is the correct answer.
Detailed Explanation
Initial rate = k[X]²[Y]. New rate = k[2X]²[3Y] = k × 4 × 3 × [X]²[Y] = 12 × k[X]²[Y]. Factor = 12.
Hint
Factor for X² is 2² = 4; factor for Y is 3; overall = 4 × 3 = 12.