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Lec-07-Chap-03-3

# Lec-07-Chap-03-3 - Lecture 07 Chemical Compounds Moles of...

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1 Lecture 07 Chemical Compounds Moles of Compounds 3.8 Percent Composition 3.9 Determining Empirical and Molecular Formulas 3.10 The Biological Periodic Table 3.11 Lecture 07, Knowledge and Skills • Calculate molar mass from formula • Perform mass-to-mole conversions • Perform mole-to-mass conversions • Know what ionic hydrates are • Calculate mass percent • Determine empirical formulas from known mass percent • Determine molecular formula from empirical formula plus information on molecular mass • Know the most important elements in biological systems Moles of Compounds A mole of X m Y n contains: m moles of atom X and n moles of atom Y 1 mol of P 4 O 10 contains: 4 mol of H atoms and 10 mol of O atoms Molar mass Molar mass = mass of one mole of a chemical element or compound Molar mass of tetraphosphorus decoxide = 4 x molar mass of P + 10 x molar mass of O = 4(30.9738 g/mol) + 10(15.9994 g/mol) = 123.8952 g/mol + 159.9994 g/mol = 283.894 g/mol Molar Mass of Ionic Compounds Ionic compounds do not contain molecules Work with

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