Question

8. A tried-and-true introductory chemistry experiment involves heating finely divided copper metal with sulfur to determine the proportions in which the elements react to form copper (II) sulfide. The experiment works well, because any excess sulfur beyond that required to react with the copper may be simply boiled away from the reaction container. Provide the balanced chemical equation for this reaction. If 1.25 g of copper is heated with an excess of sulfur, how many grams of sulfur will react

Answer 1

The reaction that occurs is:

Cu + S = CuS

The sulfur mass that reacts is calculated:

m S = 1.25 g Cu * (1 mol Cu / 63.6 g) * (1 mol S / 1 mol Cu) * (32.1 g S / 1 mol) = 0.63 g S

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