For the reaction: C₂H₄Br₂ + 3 KI → C₂H₄ + 2 KBr + KI₃
Initial rate data at 60 °C are:

The rate law is ________.

Question

For the reaction: C₂H₄Br₂ + 3 KI → C₂H₄ + 2 KBr + KI₃ Initial rate data at 60 °C are: The rate law is ________.

Quizplus · Accepted Answer

The rate law is determined by using the initial rate data and the balanced chemical equation. From the equation, it can be seen that the concentration of KI and C₂H₄Br₂ are both involved in the reaction, which means the rate law should include both concentrations. The coefficients in the balanced chemical equation indicate that the reaction is second order with respect to KI and first order with respect to the C₂H₄Br₂, so the correct rate law is rate = k[KI][C₂H₄Br₂]. This is option D.

For the Reaction: C2H4Br2 + 3 KI → C2H4

For the Reaction: C₂H₄Br₂ + 3 KI → C₂H₄