posted by tdb .
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)
Determine the mass of gold that can be extracted if 27.4 g sodium cyanide is used.
If the mass of the ore from which the gold was extracted is 157.0 g, what percentage of the ore is gold?
No arrow again and there is no space for one. You can do this unless you know the reactants and the products.
Use the same procedure as for the Na + Fe2O3 and air bag problem.
For the percent Au in the ore, (mass Au extracted/mass ore)*100 =