Copper wire with a mass of 2.196 grams reacted with excessive sulfur. And by burning the remaining sulfur, SO2 gas was created. The mass of the copper sulfide created by the reaction was 2.748 grams. 1. What is the percentage of copper sulfide? 2. What is the empirical formula of copper sulfide? 3. When the density of copper sulfide is 5.6g/cm3, how many copper ions are there per cm3?

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".