The Elementary Reaction 2NO₂ (g)→ 2NO (G)+ O₂ (G)

question 17

Multiple Choice

The elementary reaction 2NO₂ (g) → 2NO (g) + O₂ (g)
Is second order in NO₂ and the rate constant at 501 K is 7.93 × 10^-3M^-1s^-1. The reaction half-life at this temperature when [NO₂]0= 0.45 M is __________ s.

• A)3.6 × 10^-3
• B)0.011
• C)126
• D)87
• E)280

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