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Unformatted text preview: 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 • Know what ionic hydrates are • Calculate molar mass from formula • Perform mass-to-mole conversions • Perform mole-to-mass conversions • 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 Ionic Hydrates Ionic hydrate: ionic compound with water trapped in the crystal Examples Examples MgSO 4 •7H 2 O magnesium sulfate heptahydrate (Epsom salt) CuSO 4 •5H 2 O copper(II) sulfate pentahydrate • the water of hydration • use “hydrate” with a Greek prefix for the number • heat can remove some, or all, of this water Compound of the Week: Cobalt(II) Chloride, CoCl 2 CoCl CoCl 2 + + 6 H 6 H 2 O CoCl CoCl 2 ·6H ·6H 2 O • Cobalt(II) chloride, CoCl 2 , readily picks up water of hydration blue blue pink pink Intermediate stages are Intermediate stages are purple. purple....
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