questions

1.The decomposition of N2O5 is a first-order process. How many half lives would be required to decompose 99% of the sample?

(a) 7

(b) Between 6 and 7

(c) 5

(d) Between 5 and 6

2. Which of the following will confirm that the decomposition of SO2CI2 (to form SO2CI2) is a first-order process?

(a) A graph of [SO2CI2] vs. time gives a curved line.

(b) A graph of In[SO2CI2] vs. time gives a curved line.

(c) A graph of 1/[SO2CI2] vs time gives a straight line.

(d) A graph of In[SO2CI2] vs. time gives a straight line.

3. The equation for the decomposition of NO2(g) at 573 K is 2 NO2 (g)-2 NO(g)+ O2(g). Using the concentration-time data below, determine the order of the reaction with respect to [NO2].

[NO2], M time, min

0.20 0

0.095 5

0.063 10

0.047 15

(a) first order

(b) second order

(c) zero order