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Determining rate constant and reaction order

  1. Apr 22, 2010 #1
    1. The problem statement, all variables and given/known data

    CH3OCH3(g) ---> CH4(g) + H2(g) + CO(g)

    The reaction is conducted at 777.15 K, at constant volume beginning with pure ether.

    Code (Text):
    t(hours)  0    390  777  1195  3155  +inf
    P (torr) 312   408  488  562    779   931
    Determine the order of the reaction and approximate the rate constant.

    2. Relevant equations

    1) PV = nRT

    3. The attempt at a solution

    I know I need a number of moles. Pressure is related to moles as stated by equation 1.
    Unless I assign an arbitrary value to V, I cannot calculate a value for n.

    I have written this table:

    Code (Text):
                    A --------------> 3B
    t=0             a                   0
    t              a-x                +3x
    t=+inf         0                   3a
    I know I have to convert P(tot) in P(ether) using:

    P(tot) = (nA + nB) RT/V and
    P(ether) = nA RT/V

    But erm....
    major brainfreeze. (as is usually the case when trying to study after a big meal lol!)

    Thanks in advance.
  2. jcsd
  3. Apr 22, 2010 #2

    I'm done with the rest of my HW. For some reason I can't get my head around this one (and another similar problem).

    Can someone help me solve this problem? Please.

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