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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

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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


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