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WHAT IS MOLAR MASS?
• mass in grams of 1 mole of the element
• Molar Mass = ___grams____(MM) 1
Mol
Synonyms: molecular weight, gram formula unit
Use Periodic Table to determine MM!
• Let’s examine periodic table! • If I had one mole of _____ it’s molar mass would
be _______ g per 1 mol.
• Carbon MM= 12.0 g / mol
• Atomic Hydrogen MM= 1.0 g / mol
• Mercury MM= 200.6 g / mol
• Iron MM=55.8 g / mol
• Sulfur MM= 32.1 g / mol
How do you calculate molar mass of compounds?
• EX. Sulfur Trioxide Chemical Formula = _____________
• How many total atoms make up one molecule? • Atoms = _____________ • S: ___ x ______ = • O: ___ x ______ = _____ +
• The molar mass of sulfur trioxide = _______ grams per
________
SO3
1 + 3 = 4
1
3
32.1 32.1
16.0 48.0
80.1
80.11 mol
Your Turn
• EX. Phosphorus Trichloride Chemical Formula = __________
• How many total atoms make up one molecule? Atoms = ________
• P: ___ x ______ = • Cl: ___ x ______ = _________ +
• Sodium Hydrogen Carbonate NaHCO3
PCl3
1+3=4
1 31.0 31.0
3 35.5 106.5137.5 grams per 1 mol
MM = 84.0 g / mol
Representative Particles• Covalent Compounds are made up of _____.• Ionic Compounds are made up of _________. • Elements are made up of _____________.
• Use your Road Map!
molecules
Formula units
atoms
Conversions Using Molar Mass
• Book pg. 298 • Ex. #1 Write the chemical formula for aluminum oxide _________• What is given?
Trying to find?
• ______________ x _______________ = g of Al2O3
GIVEN
Al2O3
9.45 moles Al2O3
g of Al2O3
Al: 2 x 27.0 = 54.0 gO: 3 x 16.0 = 48.0 g +
102.0 g / 1 mol
9.45 moles
1 Mole Al2O3
102.9 grams Al2O3 964
Molar Volume Conversions
• At STP (Standard Temp and Pressure):
• 1 mole of gas = 22.4 L = 6.02 x 1023 particles