Determine the mass of gold that can be extracted if 20.8 g sodium cyanide is used.

To extract gold from its ore, the ore is treated with sodium cyanide solution in the presence of oxygen and water. The balanced equation is:

4 Au (s) + 8 NaCN (aq) + O2 (g) + 2 H2O (l) 4 NaAu (CN) 2 (aq) + 4 NaOH (aq)

Use the equation to find out the mass of Gold, using simple ratio method.