Stoichiometry

Stoichiometry The Proportional relationship between two or more substances during a chemical reaction.

4 Simple rules 1. Write Down the Given 2. Convert to moles 3. Use the mole ratio 4. Convert to desired units

You need to know what you start with and what you need to end with. 4 Simple rules 1. Write Down the Given You need to know what you start with and what you need to end with.

4 Simple rules 2. Convert to moles One MOLE Volume Mass # of particle units Volume Mass Molar Mass from periodic table 22.4 L 6.02 x 1023 atoms, molecules, or formula units

Where does the mole ratio come from? 4 Simple rules 3. Use the mole ratio Where does the mole ratio come from?

4 Simple rules 3. Use the mole ratio The mole ratio comes from the coefficients in a balanced Chemical Equation

4 Simple rules 3. Use the mole ratio Fe2O + 2 Li Li2O + 2 Fe What is the ratio between Fe and Fe2O?

4 Simple rules 3. Use the mole ratio Fe2O + 2 Li Li2O + 2 Fe What is the ratio between Fe and Li?

The coefficients can represent # of moles or # of molecules. 4 Simple rules 3. Use the mole ratio The coefficients can represent # of moles or # of molecules.

4 Simple rules 4. Convert to desired units If grams are desired use mass from P.T. If you need liters use 22.4L If you need atoms or molecules 6.02 x 1023 If moles are what is needed you are already done.

1 mole of (starting element/ Convert to desired unit. Grams from Periodic Table if mass 22.4 L if volume 6.02 x 1023 atoms/molecules   Mole ratio of desired compound from the balanced equation.   1 mole of (starting element/ molecule)   Write Down the given   Grams from Periodic Table if mass 22.4 L if volume 6.02 x 1023 atoms/molecules   1 mole of (ending element/ molecule)   Mole ratio of given from balanced equation.  

The End