4. A 3.5 M sample of hydrochloric acid, HCl, has a density of 1.45 g/ml. What is the mass % (wt/wt) of the sample? Use the following atomic masses: H = 1, Cl = 35.45. (Ans.: 8.80%)

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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".