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Problem- Gold can be dissolved from gold bearing ore by treating rock with sodium cyanide in the presence of oxygen.

4Au + 8NaCN + O2 + 2H2O yields 4NaAu(CN)2 + 4NaOH

If 20.00 mL of 0.0750 M NaCN are required to react with all the gold in 1550 g of rock, what is the percentage of gold in the ore sample?

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