5. Calculate the mass fraction of mercury (II) oxide in the sample, if 20 cm³ of water and 1 g of potassium iodide were added to a sample weighing 0.1500 g, the released potassium hydroxide was titrated in the presence of methyl orange 10.05 cm³ of hydrochloric acid solution with a concentration of 0, 10 mol/dm³ and a correction factor of 0.9800.

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