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Moles to Moles Stoichiometry Calculation NotesPowerPoint Presentation

Moles to Moles Stoichiometry Calculation Notes

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### Moles to Moles Stoichiometry Calculation Notes

CP Chemistry

Stoichiometry

- the study of quantitative relationships between amounts of reactants used and the products formed in a chemical reaction
- shows the conservation of matter
- mass of products = mass of reactants
- requires balanced equations!!!

Mole Ratios

- ratio of numbers between the numbers of moles of any two substances in a balanced chemical equation
- used in stoichiometric calculations
- example: 2 Al + 3 Br2 2 AlBr3
- ratio of Al:Br2 is 2:3
- ratio of Al:AlBr3 is 2:2 (or 1:1)
- ratio of Br2:AlBr3 is 3:2

Mole to Mole Calculations

- problem gives you moles of reactant or product and asks for moles of another reactant or product in the chemical equation

Steps to Solving Mole to Mole Problems

- Balance chemical equation
- Place number of moles given above compound in equation
- Place an x above the compound for which you are calculating the number of moles
- Pull down the ratios from the equation
- Cross multiply to solve for x

Example 1

How many moles of potassium needs to react with water to produce 3 moles of H2 gas?

K + H20 KOH + H2

Example 3

How many moles of oxygen would be required to fully react with 8 moles of hydrogen?

H2 + O2 H2O

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