Kinetics module 2

Course Name:  Chemistry
Course No.132 NT
Teacher:  Bill Cook
Teacher's Email:  bcook@icc.edu

No. of Questions= 3


1.  The thermal decomposition of phosphine (PH3) into phosphorus and molecular hydrogen is a first-order reaction:

  4 PH3 (g) ® P4 (g) + 6 H2 (g)

The half-life of the reaction is 35.0 s at 680 oC.   Calculate the first-order rate constant for the reaction.

a) 0.028 s-1
b) -1.70 s-1
c) 50.5 s-1
d) 1.54 s-1
e) 0.0198 s-1
2.  The rate constant for the first-order decomposition of nitrogen dioxide with a laser beam is 3.40 min-1.

NO2(g) ®  NO(g) + 1/2 O2(g)

Find the time in seconds needed to decrease the concentration of NO2 from 4.00 M to 1.50M.

a) 0.288 sec
b) 17.3 sec
c) 0.005 sec
d) 37.7 sec
e) none of these
3.  Cyclobutane, C4H8, decomposes, when heated, to give ethylene.

C4H8(g) ®  2 C2H4(g)

The reaction is first order. If the initial concentration of the cyclobutane was 0.0015 M but decreased to 0.00119 M after 455 seconds, what is the rate constant, k (in sec-1), for the reaction?

a) 4.02 x 10-3 sec-1
b) 2.21 x 10-4 sec-1
c) 5.09 x 10-4 sec-1
d) 3.05 x 10-2 sec-1
e) none of these



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