9 - Chem 6A Presentation#9 Overview Fundamentals F How are...

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Chem 6A Presentation #9 2007-10-22 1 Overview Fundamentals F How are empirical and molecular formulas found? Fundamentals G How are solutions and other mixtures analyzed and used? Fundamentals H How are chemical reactions represented using equations?
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2 What is molar mass and how is it used? Molar mass = mass of one mole = M (molar mass) = (mass of one unit) × (Avogadro's constant) M = m unit × N A (mass of a sample) = (number of moles) × (molar mass) m = n × M
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3 How are empirical and molecular formulas found? A molecular formula indicates the number of atoms in a molecule of the compound: benzene: C 6 H 6 acetylene: C 2 H 2 An empirical formula indicates the relative number of atoms in the compound : The empirical formula CH may represent: benzene or acetylene ...or something else
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4 How are empirical formulas found? One type of problem: Given the composition (masses or mass-%ages) of a sample of compound ɸ Find the empirical formula of the compound
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5 How are empirical formulas found? What is the empirical formula of a sample of a compound containing 2.82 g of sodium, 4.35 g of chlorine, and 7.83 g of oxygen?
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6 How are empirical formulas found? What is the empirical formula of a sample of a compound containing 2.82 g of sodium, 4.35 g of chlorine, and 7.83 g of oxygen? 1) Find number of moles of each element.
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