Exhibit 13-15 Consider the Decomposition of NO₂ at 300 °

question 57

Multiple Choice

Exhibit 13-15 Consider the decomposition of NO₂ at 300 ° C as shown below to answer the following question(s) . This reaction has been experimentally determined to follow second order kinetics with a rate constant of 0.543 M ^{- 1}s ^{- 1}.
2 NO₂ (g) →2 NO (g) + O₂ (g)
Assume an initial concentration of NO₂ in a closed vessel of 5.00 M.
-Refer to Exhibit 13-15. What is the remaining concentration after 60 seconds?

• A) [NO₂] = 0, This amount would completely react in this time period.
• B) [NO₂] = 1.69×10 ^{- 23} M
• C) [NO₂] = 3.55×10 ^{- 14} M
• D) [NO₂] = 0.0305 M
• E) [NO₂] = 32.8 M

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