molar mass. atomic mass mass of an atom in atomic mass units (amu) ex: carbon = 12.01 amu ...
DESCRIPTION
MOLAR MASS Mass (in grams) of 1 mole of particles of a substance Numerically equal to the atomic mass Ex: water = g C 8 H 11 NO 2 = magnesium phosphate =TRANSCRIPT
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Molar Mass
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ATOMIC MASS Mass of an atom in atomic mass units (amu) Ex: Carbon = 12.01 amu Molecular mass—sum of atomic masses (in amu)
in the molecule Ex: Water = 2 (1.01 amu) + 16.00 amu = 18.02 amu
Formula mass—sum of the atomic masses (in amu) in the formula unit of an ionic compound EX: sodium chloride = 22.99 amu + 35.45 amu =
58.44amu
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MOLAR MASS Mass (in grams) of 1 mole of particles of a
substance
Numerically equal to the atomic mass Ex: water = 18.02 g C8H11NO2 =
magnesium phosphate =
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Dimensional Analysis Examples
i. Calculate the mass in grams of 0.0450 moles of chromium.
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ii. What is the mass of 4.35 moles of sulfuric acid H2SO4?
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iii. Calculate the number of moles of 321 g of lead(II) chloride.
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iv. How many formula units are in 124 g of mercury(II) chloride?
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v. What is the mass in grams of 1.50×1015 molecules of sulfur dioxide?
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vi. A sample of aluminum chloride has a mass of 35.6 g.
1. How many moles of chloride ions are present?
2. How many chloride ions are present
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vii. How many oxygen atoms are in 37.5 grams of SO3?