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At 400 Celcius, Kc = 2.9 x 10^4 for the reaction HCHO2(g) <-->CO(g) + H2O (g) A mixture was prepared with the following initial concentrations: [CO] =0.20M, [H2O] = 0.30 M. No formic acid, HCHO2, was initially present. What was the equilibrium concentration of HCHO2?

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