Quiz#1

CHEM-111 ( Quiz # 1)

 

 

NAME : _______________________________ ID # ______________Serial No.______

 

 

Q  1.       Rate data were collected for the following reaction at a particular temperature.

               What is the correct rate-law expression?

NH4+ + NO2- --> N2 + 2H2O

Expt.

[NH4+]initial

[NO2-]initial

Initial Rate of Reaction

1

0.10 M

0.20 M

0.020 M/s

2

0.15 M

0.20 M

0.030 M/s

3

0.10 M

0.10 M

0.005 M/s



 

 

 

 

 

 

           

Q  2.            Consider the decomposition of dinitrogen pentoxide:

N2O5(g) --> 2NO2(g) + 1/2 O2(g). 

The experimentally derived rate-law expression is rate = k[N2O5]. 

At 45C, the half-life of the reaction is 23.1 minutes. Calculate the rate constant, k.