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Stoichio metry

Element. Measure. Stoichio metry. 2 H 2 + O 2  2 H 2 O. 2 molecules of hydrogen react with every molecule of oxygen to produce 2 molecules of water 2 moles of hydrogen react with every mole of oxygen to produce 2 moles of water. 2 H 2 + O 2  2 H 2 O. Multiply by 2

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Stoichio metry

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  1. Element Measure Stoichiometry

  2. 2 H2 + O2 2 H2O 2 molecules of hydrogen react with every molecule of oxygen to produce 2 molecules of water 2 moles of hydrogen react with every mole of oxygen to produce 2 moles of water

  3. 2 H2 + O2 2 H2O Multiply by 2 4 H2 + 2 O2 4 H2O 4 moles of hydrogen react with every 2 moles of oxygen to produce 4 moles of water Divide by 2 H2 + 0.5 O2 H2O 1 mole of hydrogen reacts with every 0.5 moles of oxygen to produce 1 mole of water

  4. Pancake comparison 6 250 mL of pancake batter + 500 mL milk  How much pancake batter do I need if I only want to make 2 pancakes?

  5. 2 H2 + O2 2 H2O How many moles of H2 are required to produce 4 moles of H2O? How many moles of O2 are required? 4 = 2x x = 4/2 x = 2 moles O2

  6. 2 H2 + O2 2 H2O How many moles of O2 are required to produce 0.5 moles of H2O? 0.25 moles of O2

  7. 2 H2 + O2 2 H2O How many moles of O2 are required to produce 7 moles of H2O? 3.5 moles of O2

  8. 2 H2 + O2 2 H2O m n MM What mass of O2 and H2 are required to produce 9 moles of H2O? n = m MM 144 g of O2

  9. 1 2 2 2 H2 + O2 2 H2O 4.5 9 What mass of O2 and H2 are required to produce 9 moles of H2O? 18.18 g of H2

  10. 1 2 2 2 H2 + O2 2 H2O 9 4.5 9 What mass of H20 is present when 9 moles are produced? 162.18 g of H2O

  11. 2 H2 + O2 2 H2O 4 g of H2 react with what mass of O2 in the above reaction?

  12. 1 2 2 2 H2 + O2 2 H2O 4 g of H2 react with what mass of O2 in the above reaction? 31.68 g of O2

  13. C3H8 + 5 O2 3 CO2 + 4 H2O 220 g of C3H8 react in the above reaction. What mass of H2O is produced?

  14. 4 1 5 3 C3H8 + 5 O2 3 CO2 + 4 H2O 220 g of C3H8 react in the above reaction. What mass of H2O is produced?

  15. Pb(NO3)2 + 2 NaI PbI2 + 2 NaNO3 50 mL of a 0.5 mol/L solution of NaI reacts to produce how many grams of PbI2? C = n V

  16. 2 1 2 1 Pb(NO3)2 + 2 NaI PbI2 + 2 NaNO3 50 mL of a 0.5 mol/L solution of NaI reacts to produce how many grams of PbI2?

  17. Stoichiometry Steps • Write and balance the equation • Write the ratio of substances in moles on top of the equation • Convert the given information into moles(if necessary) • Complete a cross-multiplication to determine the number of moles of the substance in question • Convert the answer into the required units (e.g. grams) • Write out the answer to the question in correct units.

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