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2H2S(g)<---> 2H2(g) + S2(g) The value of Kc for the thermal decomposition of hydrogen sulfide is 2.2x10^-4...

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Chemistry

2H2S(g)<---> 2H2(g) + S2(g)

The value of Kc for the thermal decomposition of hydrogensulfide is 2.2x10^-4 at 1400 K. A sample of gas which [H2S]=4.60 Mis heated to 1400 K in a sealed vessel. After chemical equilibriumhas been achieved, what is the value of [H2S] in M? Assume no H2 orS2 was present in the original sample.

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4.0 Ratings (672 Votes)

           2H2S(g)<---> 2H2(g) + S2(g)

I           4.6                  0            0

C         -2x                 2x            x

E        4.6-2x              2x            x

         Kc   = [H2]^2[S2]/[H2S]^2

       2.2*10^-4   = (2x)^2*x/(4.6-2x)^2

     2.2*10^-4 *(4.6-2x)^2   = 4x^3

        x   = 0.102

[H2S]   = 4.6-2x   = 4.6-2*0.102   = 4.396M

[H2}    = 2x           = 2*0.102      = 0.204M

[S2]    = x                = 0.102M
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