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8. 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) 7.2 × 10⁻² M⁻¹/s
(B) 1.7 × 10⁴ M⁻²/s
(C) 4.0 × 10⁴ M⁻²/s
(D) 4.0 × 10⁻⁷ M⁻¹/s
(E) 3.6 × 10⁻² M⁻¹/s
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