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Published byAndra Warren Modified over 5 years ago
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Chemical Composition Mole (mol) – The number equal to the number of carbon atoms in grams of carbon. Avogadro’s number – The number of atoms in exactly 12 grams of pure 12C; x 1023. One mole of anything contains x 1023 units of that substance.
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Molar mass – The mass in grams of 1 mol of the substance.
Molar Mass of an element is the mass in grams of x atoms. Molar Mass of an compound is the mass in grams of x molecules or units.
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% Composition = grams of element
of element by mass grams of compound X 100 % Composition = molar mass of element__ of element by molar mass of compound X 100 molar mass
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Hydrate – Molecule with water attached to crystalline structure. Ex
Hydrate – Molecule with water attached to crystalline structure. Ex. CuSO4 * 5H2O molar mass of H2O % Comp. H2O = molar mass of X 100 hydrate compound
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Percent to mass Mass to mole Divide by small Multiply 'til whole
Empirical Formula – Expressed the smallest whole-number ratio of the atoms present in a compound. Percent to mass Mass to mole Divide by small Multiply 'til whole
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Molecular Formula – The exact formula of a molecule, giving the types of atoms and the number of each. Compare empirical formula mass to known molar mass. Molecular formula = (empirical formula)n n = molar mass empirical formula mass
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