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Stoichiometry

Stoichiometry. “ stochio ” = Greek for element “ metry ” = measurement Stoichiometry is about measuring the amounts of elements and compounds involved in a reaction. Stoichiometry. Consider the chemical equation: 4NH 3 + 5O 2  6H 2 O + 4NO There are several numbers involved.

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Stoichiometry

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  1. Stoichiometry

  2. “stochio” = Greek for element “metry” = measurement Stoichiometry is about measuring the amounts of elements and compounds involved in a reaction. Stoichiometry Consider the chemical equation: 4NH3 + 5O2 6H2O + 4NO There are several numbers involved. What do they all mean?

  3. 4NH3 + 5O2 6H2O + 4NO Stoichiometry Recall that Chemical formulas represent numbers of atoms:

  4. 4NH3 + 5O2 6H2O + 4NO Stoichiometry Recall that Chemical formulas have molar masses:

  5. Consider: 4NH3+ 5O2 6H2O + 4NO Stoichiometry Recall that Chemical formulas are balanced with coefficients:

  6. 4NH3 + 5O2 6H2O + 4NO Stoichiometry With Stoichiometry we find out that 4 : 5 : 6 : 4 do more than just multiply atoms. 4 : 5 : 6 : 4 Are what we call a mole ratio.

  7. 4NH3 + 5O2 6H2O + 4NO Stoichiometry 4 : 5 : 6 : 4 Can mean either: 4 molecules of NH3 react with 5 molecules of O2 to produce 6 molecules of H2O and 4 molecules of NO OR 4 moles of NH3 react with 5 moles of O2 to produce 6 moles of H2O and 4 moles of NO

  8. 6 mol H2O 5 mol O2 Stoichiometry Question (1) 4NH3 + 5O2 6H2O + 4NO • How many moles of H2O are produced if 2.00 moles of O2 are used? ? mol H2O= 2.00 mol O2 = 2.40 mol H2O Notice that a correctly balanced equation is essential to get the right answer

  9. 4 mol NO 6 mol H2O Stoichiometry Question (2) 4NH3 + 5O2 6H2O + 4NO How many moles of NO are produced in the reaction if 15 mol of H2O are also produced? ? mol NO= 15 mol H2O = 10. mol NO

  10. Have we learned it yet? Try these on your own: Given: 4NH3 + 5O2 6H2O + 4NO a) How many moles of H2O can be made using 1.6 mol NH3?

  11. 6 mol H2O 2.4 mol H2O x = 4 mol NH3 Answers # mol H2O= 1.6 mol NH3 4NH3 + 5O2 6H2O + 4NO a)

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