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Chemistry 12

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given the reacting system: H2 (G) + I2(G) ---> 2HI(g) Keq= 64
Equal moles of H2, I2, and HI are placed in a 1.0 L container. Use calculations to determine the direction the reaction will proceed in order to reach equilibirum

  • Chemistry 12 -

    ..........H2 + I2 ==> 2HI
    Keq = 64 = (HI)^2/(H2)((I2)\

    Try any number, say 1
    Qrxn = (1)^2/1*1 = 1
    Try 2.
    (2^2)/2*2 = 1
    Try 3.
    3^2/3*3 = 1
    Get the picture?
    So Q = 1; K = 64. That means (from Q) that the numerator is too small and the denominator is too large (that's the only way you can get a smaller number than 64). So H2 and I2 are too large; HI is too small. Which way MUST it go?

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