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April 27, 2015

Homework Help: Chemestry

Posted by Kenah Smith on Wednesday, February 6, 2013 at 8:54pm.

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water.
4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(l) 4 NaAu(CN)2(aq) + 4 NaOH(aq)

(a) Determine the mass of gold that can be extracted if 29.3 g sodium cyanide is used.

(b) If the mass of the ore from which the gold was extracted is 146.5 g, what percentage of the ore is gold?

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