The reaction 2NO → N2 + O2 has the following rate law: 
After a period of 2.0 × 103 s, the concentration of NO falls from an initial value of 2.8 × 10-3 mol/L to 2.0 × 10-4 mol/L. What is the rate constant, k?
A) 4.0 × 10-4 M-1/s
B) 7.2 × 10-2 M-1/s
C) 1.7 × 10-4 M-1/s
D) 4.0 × 10-7 M-1/s
E) 3.6 × 10-2 M-1/s
Correct Answer:
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