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25 March, 12:01

A sample of gas in which [h2s] = 5.25 m is heated to 1400 k in a sealed vessel. after chemical equilibrium has been achieved, what is the value of [h2s]? assume no h2 or s2 was present in the original sample.

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  1. 25 March, 12:05
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    When the reaction equation is:

    by using the ICE equation:

    2H2S (g) ↔ 2 H2 (g) + S2 (s)

    initial 5.25 0 0

    change - 2X + 2X + X

    Equ (5.25-2X) 2X X

    and when Kc = 2.2 x 10^-4

    Kc = [H2]^2 / [H2S]^2

    = (2x) ^2 / (5.25-2X) ^2 by solving for X

    ∴X = 0.038 M

    ∴[H2S] = 5.25 - 2X

    = 5.25 - (2*0.038)

    = 5.174 M
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