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Xishem

  • 4 years ago

Nitrogen dioxide decomposes at 300°C via a second-order process to produce nitrogen monoxide and oxygen according to the following chemical equation. 2 NO2(g) → 2 NO(g) + O2(g). A sample of NO2(g) is initially placed in a 2.50-L reaction vessel at 300°C. If the half-life and the rate constant at 300°C are 11 seconds and 0.54 M-1 s-1, respectively, how many moles of NO2 were in the original sample? I just need an idea on how to approach this problem.

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  1. Rogue
    • 4 years ago
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    How about the second order rate law equation?

  2. Xishem
    • 4 years ago
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    \[Rate=k[NO_2]^2\]I have the rate constant, but how do I determine the rate or the concentration of NO_2?

  3. Rogue
    • 4 years ago
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    Well, I was talking about this equation\[1 / [A]_{t}^{} = 1/[A]_{0}^{} + kt\]

  4. Xishem
    • 4 years ago
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    Oh, the integrated rate law for a second order reaction. Ok.

  5. Rogue
    • 4 years ago
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    I haven't done this in a year, so I forgot all the terminologies and stuff, sorry.

  6. Xishem
    • 4 years ago
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    That gives me an idea of what to do. Let me work a few things out.

  7. Rogue
    • 4 years ago
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    \[t _{1/2}^{} = 1 / (k [A]_{0}^{})\]

  8. Xishem
    • 4 years ago
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    \[\frac{1}{[A]_t}=\frac{1}{[A]_0}+kt\]\[[A]_t=\frac{1}{2}[A]_0\]\[\frac{2}{[A]_0}=\frac{1}{[A]_0}+kt\]I then solved for [A]_0 to get 5.94 M^-1, and multiplied by the volume of the solution. Thank you!

  9. Rogue
    • 4 years ago
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    Seems like I haven't forgotten all my chem yet, woohoo :)

  10. Xishem
    • 4 years ago
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    Chemistry knowledge is so much more volatile than any other subject :P

  11. Rogue
    • 4 years ago
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    Volatile or valuable? Chem is my favorite science :) Bio is too much memorization. Physics is too much math, chem is the right balance :D

  12. Xishem
    • 4 years ago
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    Volatile. Chemistry is so much based on your understanding of the subject rather than the pure math behind it. If you don't fully understand the subject (like I don't fully understand rate laws), it will disappear in a matter of weeks. I can not do physics for years, and just jump right back in, because it's just basic problem solving and algebra :P

  13. Xishem
    • 4 years ago
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    Chem is still the best, I agree <3

  14. Xishem
    • 4 years ago
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    The answer to the question is 0.42mol, if someone happens to be trying to learn from this.

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