9. To determine the content of zinc oxide in the preparation, its sample weighing 0.1821 g was treated with 30.00 cm3 of a 0.1 N solution of potassium hexacyanoferrate (II). For titration of the solution over the precipitate, 23.75 cm3 of a 0.1 N solution of zinc sulfate were used with a correction factor of 1.010. What is the mass fraction of zinc oxide in the test preparation?

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