HomeFrequently Asked Questions (FAQs)FAQs ChemistryFAQs Chemistry: Chemical Formulas and Equations, Stoichiometry and Mole Concept FAQs Chemistry: Chemical Formulas and Equations, Stoichiometry and Mole Concept 1513 ~ What is an ionic equation? How do you write these equations? ~ Write down the 3 formulas to find the number of moles of a substance. ~ Define relative atomic mass. ~ Define relative molecular mass.