3. Determine the equilibrium concentrations of hydrogen and iodine in the reaction H2 I2 ↔2 HI, if it is known that their initial concentrations are 0.02 mol/l each, and the equilibrium concentration of HI is 0.03 mol/l. Express the equilibrium composition of the mixture as a percentage.
To solve the problem, it is necessary to use the law of mass action.

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