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MarcLeclair Group Title

URGENT! Consider the following decomposition reaction of ammonium carbonate ((NH4)2CO3): (NH4)2CO3 (s)  2 NH3 (g) + CO2 (g) + H2O (g) In one experiment at 25.0°C, a sample of pure (NH4)2CO3 is placed in an evacuated 2.00 L vessel. At equilibrium, the total pressure is found to be 0.8944 atm. (a) Determine the equilibrium partial pressure of each gaseous species. (b) Determine the mass of ammonium carbonate ((NH4)2CO3) that must have reacted in order to achieve equilibrium. (c) Determine the value of Kp assuming that the reaction temperature is 25.0°C. I can find a but I am stuck at b

  • 2 years ago
  • 2 years ago

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  1. Awstinf Group Title
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    use PV=nRT to find the moles and then convert back

    • 2 years ago
  2. MarcLeclair Group Title
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    but wait Im stuck with the ATM at equilibrium, the solid doesnt affect equilibrium at all, so how can I find it with the equilibrium of Pressure Don't I need concentration?

    • 2 years ago
  3. Awstinf Group Title
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    So you have pressure at EQ right?

    • 2 years ago
  4. Awstinf Group Title
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    4x=.8944

    • 2 years ago
  5. MarcLeclair Group Title
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    Yeah, the total, and I can use basic mole ratio to find individual pressure

    • 2 years ago
  6. Awstinf Group Title
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    solve for x then use the pressure for lets say CO2 put that into PV=nRT then solve for n then convert over

    • 2 years ago
  7. MarcLeclair Group Title
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    So I need to find n for one product than just use stoichiometry ?

    • 2 years ago
  8. Awstinf Group Title
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    yeah it should work.

    • 2 years ago
  9. Awstinf Group Title
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    let me work it out for you really fast

    • 2 years ago
  10. MarcLeclair Group Title
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    Alright ill try it and post if it works

    • 2 years ago
  11. Awstinf Group Title
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    (.2236)(2)/(298*.08206) = .0183*96g/mol = 1.76g

    • 2 years ago
  12. MarcLeclair Group Title
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    I cant beleive I didnt think of that, and for C , Q goes to infinity no? How to I possible use my Equilibrium constant equation?

    • 2 years ago
  13. MarcLeclair Group Title
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    How do I possibly*

    • 2 years ago
  14. Awstinf Group Title
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    for C? all you do is [NH3]^2[CO2][H2O]=Kp x=.2236 (2*.2236)^2(.2236)*(.2236)=.001

    • 2 years ago
  15. Awstinf Group Title
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    Not for PNH3 not [NH3] for each

    • 2 years ago
  16. MarcLeclair Group Title
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    Oh I thought you had to use ICE and Q to find the direction of the reaction :/ Apparently you don't thanks a lot!

    • 2 years ago
  17. Awstinf Group Title
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    Q is to judge where you are in respect to K if you have a larger Q you know you have far too many products so you need to get more reactants so the reaction goes to the left, if you have a small Q you know you have too many reactants and you need to go to products. you as in the reaction lol.

    • 2 years ago
  18. MarcLeclair Group Title
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    Ah I get it its just to judge the direction of the reaction BEFORE equilibrium but here we already reached it! Thanks a lot!

    • 2 years ago
  19. Awstinf Group Title
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    Yep you got it! good luck!

    • 2 years ago
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