CHEM CHAP 3 - Stoichiometry mass(g-mols-number of atoms...

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Stoichiometry mass(g)-mols-number of atoms- number of atoms of element Number of mols=mass/molar mass…. mass=n x molar mass Molar mass=grams/mols Avogadro’s number(N A )= 1mol = 6.02 x 10 23 ….12 grams of carbon-12 Formula Weight: atomics weights added multiplied by number of atoms of each element in the formula Molecular Weight: Formula weight for substances that exist as individual molecules Percent Composition: (number of atoms in formula) x (molar mass of element) divided by 1 mol of compound Pure compound: same elements and same proportions by weight
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