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Molar Mass. 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

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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 = g C 8 H 11 NO 2 = magnesium phosphate =

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Page 1: Molar Mass. 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

Molar Mass

Page 2: Molar Mass. 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

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

Page 3: Molar Mass. 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

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 =

Page 4: Molar Mass. 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

Dimensional Analysis Examples

i. Calculate the mass in grams of 0.0450 moles of chromium.

Page 5: Molar Mass. 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

ii. What is the mass of 4.35 moles of sulfuric acid H2SO4?

Page 6: Molar Mass. 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

iii. Calculate the number of moles of 321 g of lead(II) chloride.

Page 7: Molar Mass. 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

iv. How many formula units are in 124 g of mercury(II) chloride?

Page 8: Molar Mass. 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

v. What is the mass in grams of 1.50×1015 molecules of sulfur dioxide?

Page 9: Molar Mass. 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

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

Page 10: Molar Mass. 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

vii. How many oxygen atoms are in 37.5 grams of SO3?

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