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Homework Help: Reaction Rates & Gases question

  1. Jan 27, 2010 #1
    1. The problem statement, all variables and given/known data
    In the gas phase methyl isocyanide (CH3NC) isomerizes to methyl cyanide (CH3CN) in a first order reaction with a rate constant of 7.70x10^-4s^-1 at 500K. An experiment is performed, where 25.0 torr of methyl isocyanide is placed in 23.2L container at 500K.

    After 520 seconds, what is the pressure of methyl cyanide?

    2. Relevant equations
    ln (P)t/(P)0 = -kt

    3. The attempt at a solution
    I used the equation above to solve for (P)t, and I got 16.75, but the answer in my book is 8.25 torr, what am I doing wrong here? Please help...
  2. jcsd
  3. Jan 28, 2010 #2


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    Are you sure that you didn't solve for methyl isocyanide?
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