A student mixes magnesium and hydrochloric acid and a chemical reaction occurs, shown in the equation below.                                                     ____ Mg + _____ HCl -------->   _____ H2 + ______ MgCl   1.) How many moles of magnesium would you need for the reaction if you had 2 moles of HCl?   2.)  How many moles of magnesium would you need for the reaction if you had 4 moles of HCl?   3.)  How many moles of hydrogen gas (H2) would be produced if you started with 2 moles of magnesium and 2 moles of hydrochloric acid (HCl)?

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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".