Chemistry Practice Problems Identifying Reaction Order Practice Problems Solution: The decomposition of urea (NH 2CONH2), an end prod...

Solution: The decomposition of urea (NH 2CONH2), an end product in protein metabolism, occurs according to the following reaction:  NH2CONH2 (aq) + H+ (aq) + 2H 2O (l) → 2NH 4 + (aq) + HCO3– (aq) The rate of decomposition only depends on the concentration of urea, and the rate constant for the decomposition is 4.28 x 10-4 s-1 at 25 oC. a. What is the order of the decomposition reaction? How can you tell?   b. What is the concentration of urea in this solution after 2 minutes if the starting concentration is 0.500 M?      

Problem

The decomposition of urea (NH 2CONH2), an end product in protein metabolism, occurs according to the following reaction: 

NH2CONH2 (aq) + H+ (aq) + 2H 2O (l) → 2NH 4 + (aq) + HCO3 (aq)

The rate of decomposition only depends on the concentration of urea, and the rate constant for the decomposition is 4.28 x 10-4 s-1 at 25 oC.

a. What is the order of the decomposition reaction? How can you tell?

 

b. What is the concentration of urea in this solution after 2 minutes if the starting concentration is 0.500 M?