1. Moles and Mass
-The molar mass of a compound (aka molecular mass or molecular weight) is the sum of the atomic masses of each atom in the compound
-Molar mass is expressed in units of grams per mole
(g/mol)
-The periodic table can be used to find the atomic masses of each element
(1 mole of sugar,
salt, carbon,
copper, and
oxygen)

2. Moles and Mass To calculate the molar mass of CO2: 1 mole of CO2 =
1 C atom = grams + 2 O atoms = 2 × grams
total molecular mass for CO2 is grams per mole
(1 mole of copper,
salt, and water)

3. Moles and Mass
-The mass of a sample of a compound can be converted to moles by dividing its mass by the molar mass of the compound
To calculate the number of moles from a mass:
Ex. 88 g of CO2
C = 12 g x O = 16 x 2 = 32 g = g
88 g CO2 / 44 g CO2 = 2 moles

4. Moles and Mass Practice
Answer the following questions:
What is the molar mass of CO2?
What is the molar mass of H2O?
What is the molar mass of O2?
What is the molar mass of NaCl?
What is the molar mass of MgO2?
What is the molar mass of AgNO3?
How many moles is 44.0 g of CO2?
How many moles is 32.0 g of O2?
How many moles is 18.0 g of H2O?