189. Some time after the start of the reaction 3A B↔2C D, the concentrations of substances were: [A] = 0.03 mol/l; [B] = 0.01 mol/l; [C] = 0.008 mol/l. What are the initial concentrations of substances A and B?
Answer: SA = 0.042 mol/l; CB = 0.014 mol/l.

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