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Chem3 Ch8.p1


mole the number of carbons in exactly 12 grams of pure Carbon-12
Avogadro's Number 1 mol = 6.022 x 10 to the power 23 (6.022 x 10 to the 23 atoms/mole)
Molar Mass is the mass in grams of 1 mole of atoms. The mass of one mole of atoms(g/mol): 1 mole of Si weighs 28.09 g 0r 28.09 amu
Atomic Mass is the average atomic mass of isotopes of an element expressed in atomic mass units (amu). the atomic mass is listed in the periodic table just below the element symbol. 1 average Si atom is 28.09 amu
Molar Mass of a compound is the sum of the molar masses in the compound in grams per mole (g/mol)
Percent Composition Mass percent of each element in a compound
Empirical Formulas Simplest formulas show which elements are present in a compound , with their mole ratios indicated as subscripts. Subscripts are mole-to-mole ratios (P2O5=2 mole P:5 mole O)
Molecular Formulas Chemical formulas indicate the type and number of atoms in a molecule. Subscripts are actual numbers of atoms per molecule (P4O10= 4 mole and 10 mole O). Multiply empirical subscripts by n to get molecular subscripts
Created by: nikkimem32