Solution of task 138 of Chemistry Book Shimanovich 2003

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138. At a certain temperature, the equilibrium of the homogeneous system 2NO + O2 2NO2 was established at the following concentrations
of reacting substances: [NO] p = 0.2 mol / l; [O2] p = 0.1 mol / l; [NO2] p = 0.1 mol / l.
Calculate the equilibrium constant and the initial concentration of NO and O2.

The answer is: K = 2.5; [NO] ex = 0.3 mol / l; [O2] exx = 0.15 mol / l.

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