![]() The average mass of a monatomic ion is the same as the average mass of an atom of the element because the mass of electrons is so small that it is insignificant in most calculations.Ĭalculate the molecular mass of ethanol, whose condensed structural formula is CH 3CH 2OH. Because a molecule or a polyatomic ion is an assembly of atoms whose identities are given in its molecular or ionic formula, we can calculate the average atomic mass of any molecule or polyatomic ion from its composition by adding together the masses of the constituent atoms. ![]() Although the mass number is unitless, it is assigned units called atomic mass units (amu). The mass number is an integer that is approximately equal to the numerical value of the atomic mass. ![]() To calculate the molecular mass of a covalent compound and the formula mass of an ionic compound and to calculate the number of atoms, molecules, or formula units in a sample of a substance.Īs you learned in Chapter 1 "Introduction to Chemistry", the mass number is the sum of the numbers of protons and neutrons present in the nucleus of an atom.
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