I can't tell the difference between reactants and products because you don't have an arrow to indicate the separation; however, you can work this by following the example here. Just follow the steps.
http://www.jiskha.com/science/chemistry/stoichiometry.html
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 21.4 g sodium cyanide is used.
If the mass of the ore from which the gold was extracted is 126.0 g, what percentage of the ore is gold?
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