CHEM 121 Lecture Notes - Lecture 4: Unified Atomic Mass Unit, Molar Mass, Calcium Hydroxide
31 Oct 2017
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Document Summary
Atoms are exceedingly small, yet their masses have been experimentally determine for each of the elements. The unit of measurement for these determinations is the atomic mass unit (amu). The periodic table provides atomic weights in amu. The mass of 1 mol of atoms, in g, is defined as the molar mass. The atomic mass of an element corresponds to the average mass of a single atom in amu and the mass of a mol of atoms in g. Chart 1: interconversion between numbers of mol, particles, and g. the mol m concept is central to chemical calculations involving measured quantities of matter. The mole (mol) the amount of a substance expressed in grams containing as many atoms, molecules, or ions as the number of atoms in 12 grams of carbon-12. > this number is experimentally determined as avogadro"s number. 1 mol of atoms = 6. 022 x 1023 atoms of an element lar mass.
