How do I solve this rate law problem?

Question

For the reaction 2A+B==>C+D if the concentration of A is doubled, the reaction doubles. If the concentration of B is halved there is no change in the reaction rate. Determine the order of reaction with respect to each reactant and the overall order of reaction.

 

Write the rate law for the reaction.

Answer 1

[A] double and rate doubles means it is 1st order in A

[B] cut in half and no effect on rate means it is zero order in B

Overall order is 1 + 0 = 1 or first order overall.

Rate = k[A] is the rate law for this reaction.