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STOICHIOMETRY

Learn how to calculate quantities in chemical equations using stoichiometry. Understand the concept of moles and the ratio of reactants to products. Practice converting moles to moles using given coefficients.

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STOICHIOMETRY

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  1. STOICHIOMETRY Mole to Mole

  2. The calculation of quantities in chemical equations is called stoichiometry. • In every chemical reaction the mass and atoms stay the same. • The coefficients represent the numbers of moles or atoms and molecules.

  3. In the reaction 2CO + O2 2CO2, the ratio of moles of oxygen used to moles of CO2 produced is 1:2 • A correct interpretation of the balanced equation 2Al(s) + 3Pb(NO3)2(aq) 2Al(NO3)3(aq) + 3Pb(s) is … 2 moles Al + 3 moles Pb(NO3)2 2 moles Al(NO3)3 + 3 moles Pb

  4. In C5H12 + 8O2 5CO2 + 6H2O • 9 moles of reactants chemically change into 11 moles of product.

  5. To convert from moles to moles: • start with the given • use one times sign • what you want should be on top • use given unit on the bottom • write the coefficients in front of the units

  6. Ex: How many moles of aluminum oxide are produced when 0.64 mol of aluminum reacts with oxygen? • 4Al + 3O2 2Al2O3 start with the given use one times sign what you want should be on top use given unit on the bottom write the coefficients in front of the units

  7. Ex: How many moles of aluminum oxide are produced when 0.63 mol of oxygen reacts with aluminum? • 4Al + 3O2 2Al2O3 start with the given use one times sign what you want should be on top use given unit on the bottom write the coefficients in front of the units

  8. Ex: If 3.0 moles of HCl are consumed in the reaction below; how many moles of FeCl3 are produced? • 6HCl + Fe2O3 2FeCl3 + 3H2O start with the given use one times sign what you want should be on top use given unit on the bottom write the coefficients in front of the units

  9. Ex: Given the balanced equation • 16HCl + 2KMnO4 2KCl + 2MnCl2 + 5Cl2 + 8H2O if 1.0 mol of KMnO4 reacts, how many moles of H2O are produced? start with the given use one times sign what you want should be on top use given unit on the bottom write the coefficients in front of the units

  10. EX: Calculate the number of moles of Al2O3 that are produced when 0.60 mol of Fe is produced in the following reaction. • 2Al + 3FeO  3Fe + Al2O3 start with the given use one times sign what you want should be on top use given unit on the bottom write the coefficients in front of the units

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