PLEASE HELP EMERGENCY!!!?

Question

5. Write the rate law for the reaction: A + 2B → C + D, based on the following data.

  [A]     [B]     Initial rate (M/s)

0.100  0.100    1.25 x 10-3

0.200  0.100    2.50 x 10-3

0.100  0.200    1.25 x 10-3

Answer 1

Rate law answer is written as

rate = k [A]^m [B]ⁿ where k is constant (leave it as k)

you now only need to find the value of orders m and n

use only the experimental data here

pick 2 rows, keeping either [A] or [B] constant.

for example (not from the above problem): [A] = 2 , [B] =1, rate =4 & [A] = 4, [B] =1, rate = 8 . B is unchanged so cannot affect rate

multiplying A by 2x gives a rate increase by 2x , so the exponent on A is 1.

if rate increased to 16 and instead of 8, a 2x increase in [A] gives a 4x increase in rate, so the exponent on [A] would be 2 (as in 2^2 = 4x)

Repeat the process, keeping [A] constant and changing [B] to find the exponent of [B]

Hope this helps