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Stoichiometry

Learn to apply mole ratios in chemical reactions with step-by-step examples. Understand how to calculate moles and balance equations effectively. Practice problems included.

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Stoichiometry

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  1. Stoichiometry Mole-Mole

  2. Mole Ratio Amole ratiois a conversion factor that relates the amounts in moles of any two substances involved in a chemical reaction Example:2Al2O3(l)  4Al(s) + 3O2(g) Mole Ratios:2 mol Al2O3 2 mol Al2O3 4 mol Al 4 mol Al 3 mol O2 3 mol O2

  3. Steps in Solving Problems… • Write a balanced chemical equation • Identify the given (known) and the unknown • Write out your given, mole ratio (unknown/known) • Multiply or divide to get your answer and don’t forget your units!!

  4. Practice Problem • Nitrogen adds with hydrogen to form ammonia. How many moles of hydrogen are needed to completely react with two moles of nitrogen? Answer: 6 moles H2

  5. Practice Problem 2. Potassium chlorate decomposes to form potassium chloride and oxygen gas. How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate? Answer: 9 moles O2

  6. Practice Problem 3.Potassium chlorate decomposes to form potassium chloride and oxygen gas. How many moles of oxygen are produced by the decomposition of six moles of potassium chlorate? Answer: 3 moles 

  7. Practice Problem 4. C3H8 + 5O2 3CO2 + 4H2O, How many moles of oxygen are necessary to react completely with four moles of propane (C3H8)? Answer: 20 moles O2

  8. Practice Problem 5.K3PO4 + Al(NO3)3 3KNO3 + AlPO4, How many moles of potassium nitrate are produced when two moles of potassium phosphate react with two moles of aluminum nitrate? Answer: 6 moles KNO3

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