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 =
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?
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