For questions 16 and 17) Paraldehyde (C6H12O3) decomposes by a first order reaction at
225ºC to acetaldehyde (C2H4O). The rate constant of this reaction at 225ºC is 3.05 x 10-4s-1.

16. If we start with a 0.250 M concentration of paraldehyde, what will its concentration be
after 2.00 minutes?
C6H12O3 (g)  C2H4O(g)
a) 0.241 M
b) 0.350 M
c) 2.41 M
d) 0.845 M
e) 2.25 M


17. How long does it take for half the sample of Paraldehyde to decompose?
a) 38 min
b) 15 min
c) 20 s
d) 2,000 min
e) 38 s