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Posted by on Sunday, February 14, 2010 at 11:35pm.

Consider the following reaction:
A reaction mixture initially containing 0.500M H2S and 0.500M SO2 was found to contain 1.0×10−3M at a certain temperature. A second reaction mixture at the same temperature initially contains 0.255M H2S and 0.320M SO2. Calculate the equilibrium concentration of H2O in the second mixture at this temperature

  • CHEMISTRY - , Monday, February 15, 2010 at 12:22am

    Is that 1.0 x 10^-3 M H2O or something different. You should read your posts to make sure all of the information is there. I will assume it is (H2O). Have you checked the equation? It isn't balanced. I will balance it. And I wonder if the temperature is high enough so H2O is a gas? I will assume it is. In fact, I will write it as such in the equation.
    2H2S + SO2 ==>3S(s) + 2H2O(g)
    K = (H2O)^2/(H2S)^2(SO2).
    Make an ICE chart.
    H2S = 0.5 M
    SO2 = 0.5 M
    H2O = 0

    H2O = +1.0 x 10^-3
    SO2 = -0.5 x 10^-3
    H2S = -1.0 x 10^-3

    H2S = 0.5-1.0 x 10^-3
    SO2 = 0.5- 0.5) x 10^-3
    H2O = 0 + 1.0 x 10^-3
    Plug those equilibrium concns into the Keq expression I wrote above to find Keq.

    Then prepare another ICE chart for the new mixture which will be
    H2S = 0.255 M
    SO2 = 0.320 M
    H2O = 0
    H2O = +2x
    SO2 = -x
    H2S = -2x

    H2O = 2x
    SO2 = 0.320- x
    H2S = 0.255-2x
    Plug those values into the Keq expression and using Keq you calculated before, determine the value of x. That times 2 will be the equilibrium value for H2O. Post your work if you get stuck.

  • CHEMISTRY - , Friday, February 19, 2010 at 5:52pm

    write an expression for ka hor the dissociation of HBr, when HBr is dissociated, it loses its H+

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