Molar Mass & Conversions. The Mole mole (mol)- SI Unit for the amount of a substance that contains as many particles as there are atoms in exactly 12g.

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Presentation transcript:

Molar Mass & Conversions

The Mole mole (mol)- SI Unit for the amount of a substance that contains as many particles as there are atoms in exactly 12g of carbon-12. A unit of counting, like the dozen.

Avogadro’s Number Avogadro’s Number - the number of particles in exactly one mole of a pure substance. 1 mole = X mol = x Amedeo Avogadro

Atomic Mass atomic mass - the mass of one mole of an atom Atomic mass is expressed in atomic mass units (amu) or (u) or g/mol. Can be found on the periodic table. All atomic masses are based on the atomic mass of carbon-12 being 12 amu.

Molar Mass molar mass - the mass of one mole of a pure substance. Molar mass is written in units of amu or g/mol.

Atomic mass vs. Molar mass atomic mass - the mass of one mole of an atom. molar mass - the mass of one mole of a pure substance.

Atomic Mass vs. Molar Mass ExampleAtomic MassMolar Mass Na Ag C O g/mol g/mol g/mol g/mol

Molar Mass of Compounds CompoundMolar Mass H2OH2O C 6 H 12 O 6 NaCl Cl 2 (NH 4 ) 3 PO 4 CuSO 4 ·5H 2 O g/mol g/mol g/mol g/mol g/mol g/mol

Introduction to Molar Conversions AmountMass 1 mol O 2 ½ mol O 2 2 mol O 2 3 mol O g g g g

Grams to Moles Converting grams to moles: divide by molar mass. 1. How many moles of Ca are in 5.00g of Ca? 2. How many moles of H 2 O are in 36.0g of H 2 O? 3. How many moles of AgNO 3 are in 124.5g of AgNO 3 ?

Moles to Grams Converting from moles to grams: multiply by molar mass. 1.What is the mass in grams of 2.25 moles of Fe? 2.What is the mass in grams of moles of BaCl 2 ?

Types of Particles Atoms – C, Cu, He Molecules – O 2, C 12 H 22 O 11, CO 2 (all nonmetals in the formula) Formula units – NaCl, CaCl 2, Mg(NO 3 ) 2 (includes a metal in the formula)

Particles to Moles Converting particles to moles: divide by Avogadro's Number. 1.How many moles of Pb are in 1.50 X atoms of Pb? 2.How many moles of CO 2 are in 6.78 X molecules of CO 2 ? 2.49 x 10 1 moles Pb 1.13 x moles CO 2

Moles to Particles Converting moles to atoms: multiply by Avogadro's Number. 1.How many molecules of NO are in 0.87 moles of NO? 2.How many formula units of NaI are in 2.50 moles of NaI? 5.2 x molecules NO 1.51 x formula units NaI

Grams to Moles to Particles Example: How many molecules of N 2 are in 57.1g of N 2 ?

Particles to Moles to Grams Example: How many grams of NaF are in 7.89 X formula units of NaF?

Atoms to Moles to Grams Tough Example: How many total atoms are in 235 g of CO 2 ? 9.64 x total atoms

The Mole Bridge