For many years the recovery of gold—that is, the separation of gold from other materials—involved the use of potassium cyanide:     Au + KCN + O2 + H2O à  KAu(CN)2 +  KOH     (a) Balance the above chemical equation. (b) What is the minimum amount of potassium cyanide in grams needed to extract 29.0 g (about an ounce) of gold?

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.