1. 9.4 – NOTES Avogadro and Density

2. V. Stoichiometry involving Avogadro’s number and density
A. One fraction could involve the conversion factor 1 mole=6.02 x particles
Example: How many molecules of carbon dioxide are formed when grams of methane are burned in air?
CH4 + 2O2  CO H2O
Given: 50.0 g CH4 (16.0g/mol) Find: molecules CO2
50.0 g CH4 x 1 mol CH4 x 1 mol CO2 x x 1023 molecules
16.0 g CH mol CH mol CO = 1.88 x 1024 m-c

3. B. One fraction could involve the density of a reactant or product.
Example: If you burn 1.00 L of octane in your car, how many moles of carbon dioxide are generated? The density of octane is g/mL.
2C8H O2  16CO H2O
Given: 1.00L C8H18 (114.2 g/mol) Find: mole CO2
1000mL C8H18 x g C8H18 x 1 mol C8H18 x 16 mol CO2
1 mL C8H g C8H mol C8H18 =55.3 mol CO2