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

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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 2

How many moles of water can be produced with 6 moles of hydrogen?

H2 + O2 H2O

Example 3

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

H2 + O2 H2O

Example 4

How many moles of water can be produced with 4 moles of oxygen?

H2 + O2 H2O

Example 5

How many moles of hydrogen would be required to produce 10 moles of water?

H2 + O2 H2O

Example 6

How many moles of oxygen would be needed to produce 20 moles of water?

H2 + O2 H2O