a. How many ATOMS of boron are present in 7.41 grams of boron trichloride? 3.805x10^21 atoms of boron . b. How many GRAMS of chlorine are present in 7.42 x 1022 molecules of boron trichloride? grams of chlorine.

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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".