Chemistry 120 Test Questions and Answers

formula weight Sum of all the masses, in AMU, present in one molecule of a molecular compound. molecular weight The sum of the atomic weights of a molecule. Avogadro's number 6.022 x 10²³ molar mass numerically equal to the formula weight in atomic mass units chemical formula notation that uses symbols with numerical subscripts stoichiometry The branch of chemistry that deals with the measurement of the quantities of reactants and products of a chemical reaction is called stoichiometry. percent composition calculates the relative number of moles of the reactants and products molecular formula A chemical formula that shows the number and kinds of atoms in a molecule, but not the arrangement of the atoms. empirical formula a chemical formula showing the ratio of elements in a compound rather than the total number of atoms subscripts numbers written below the line that tell how many atoms of a given type are in a compound.