Wake-up 1.Study Polyatomic Ions for about 5/10 minutes. Write NO WAKE-UP on Friday.

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Presentation transcript:

Wake-up 1.Study Polyatomic Ions for about 5/10 minutes. Write NO WAKE-UP on Friday

MOLAR MASS What is molar mass? How do you calculate molar mass?

Mole The unit for a specific amount of a substance/particle

Avogadro’s Number 1 mole = 6.02 x particles

Types of particles measured by Moles Atoms, elements, covalent compounds or ionic compounds

Mole Road Map

Practice Problem 1. How many cadmium atoms are there in 6.57x10 3 moles?

Practice Problem 2. How many moles of nitrogen are there in 4.3x10 23 molecules?

Mole Road Map Moles to Mass OR Molar Mass

The sum of the atomic weights of all the atoms in a molecule

Molar Mass Units Molar Mass (MM) = Grams Moles (g/mol)

Use Periodic Table to determine MM If there was one mole of Sodium (Na), it’s molar mass would be ________________ g/mol.

Carbon MM= 12.0 g / mol Mercury MM= g / mol Iron MM=55.8 g / mol

How many particles do these elements contain? Particles: 1.Atoms 2.Formula Units 3.Molecules

How do you calculate molar mass of compounds? EX. Sulfur Trioxide Chemical Formula = ___________ How many total atoms make up one molecule? Total Atoms = _____________ S: ___ x ______ = O: ___ x ______ = Molar Mass: __________ + ____________ The molar mass of sulfur trioxide = _______ g/mol SO =

Your Turn EX. Phosphorus Trichloride Chemical Formula = _________ How many total atoms make up one molecule? Atoms = _______ P: ___ x ______ = Cl: ___ x ______ = _________ + Sodium Hydrogen Carbonate NaHCO 3 PCl 3 1+3= grams per 1 mol MM = 84.0 g / mol

Conversions using Molar Mass 1. How many grams are in 4.5 moles of sodium fluoride?

Conversions using Molar Mass 2. How many moles are in 3.4 x grams of silicon dioxide?

Conversions using Molar Mass 3. How many moles are in 68 grams of Copper (II) hydroxide?

Conversions using Molar Mass 4. How many grams are in 2.3 x moles of Calcium phosphate?