2 H2S (g) <--------> 2 H2 (g) + S2 (g)
Kc = 2.25 x 10^-4
[H2S] = 5.10 x 10^-3 M
[H2] = 1.30 x 10^-3 M
[S2] = ??
Kc = [H2]^2 [S2] / [H2S]^2
2.25 x 10^-4 = (1.30 x 10^-3)^2 x [S2] / [5.10 x 10^-3]^2
[S2] = 3.46 x 10^-3 M
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