What would be the order of this reaction with respect to Br-?

Question

instantaneous reaction rate (M/s)3Br-==>C3H6+2Cl-+3Br-

which gives the following data:

trial 1

Initial concentration of C3H6Cl2(M)

0.080

Initial concentration of Br-(M)

0.080

instantaneous reaction rate (M/s)

0.116

trial 2

Initial concentration of C3H6Cl2(M)

0.160

Initial concentration of Br-(M)

0.080

instantaneous reaction rate (M/s)

0.232

trial 3

Initial concentration of C3H6Cl2(M)

0.160

Initial concentration of Br-(M)

0.160

instantaneous reaction rate (M/s)

0.232

Answer 1

The reaction you give is not correct and isn't even possible. I'll assume it is supposed to be

C₃H₆Cl₂ + 3Br^- ==>C₃H₆ + 2Cl^- + 3Br^-

Comparing trials 2 and 3, we see that [Br-] is doubled and [C₃H₆Cl₂] remains constant. The rate remains the same telling us the reaction is ZERO order with respect to Br-