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Stoichiometry

Stoichiometry. Chemical Quantities Chapter 9. What is stoichiometry?. stoichiometry- method of determining the amounts of reactants needed to create a certain amount of products. we will combine balancing equations with molar mass and add one more step. How to do it.

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Stoichiometry

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  1. Stoichiometry Chemical Quantities Chapter 9

  2. What is stoichiometry? • stoichiometry- method of determining the amounts of reactants needed to create a certain amount of products. • we will combine balancing equations with molar mass and add one more step.

  3. How to do it • the coefficients in a balanced equation are ratios of the molecules needed for the reaction. • moles are just a number of molecules • so 2 H2 + O2 2 H2O • How many moles of H2O are made by completely reacting 1.4 mol of O2 =2.8 mol H2O

  4. Adding in molar mass • How many grams of H2 are needed to completely react with 24 g of O2? • 2 H2 + O2 2 H2O • convert to moles  convert to the desired molecule  convert to grams • O2 = 32.00 g/mol ; H2 = 2.016 g/mol = 3.0 g H2

  5. Practice • How many grams of H2O are produced from 15 g of H2? • 2 H2 + O2 2 H2O = 130 g H2O

  6. practice • How many grams of H2O are produced by completely reacting 24 g of O2? • 2 H2 + O2 2 H2O • convert to moles  convert to the desired molecule  convert to grams • O2 = 32.00 g/mol ; H2O = 18.016 g/mol = 27 g H2O

  7. Another • How many grams of H2 are needed to form 34 g of H2O? • 2 H2 + O2 2 H2O • convert to moles  convert to the desired molecule  convert to grams • H2 = 2.016 g/mol ; H2O = 18.016 g/mol = 3.8 g H2

  8. Balance the equation 1st, then do the problem 2 2 • Na + Cl2 NaCl • How many grams of chlorine are needed to react with 37 g of Na? =57 g Cl2

  9. More • CH4 + O2 H2O + CO2 • How many grams of CH4 are needed to make 120 g of H2O? 2 2 = 53 g CH4

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