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STOICHIOMETRY

STOICHIOMETRY. What is it?. Stoichiometry is the science of measuring the quantitative proportions or mass ratios in which chemical elements stand to one another. BASICALLY…IT IS THE STUDY OF THE RELATIONSHIP BETWEEN THE MASSES (SOMETIMES VOLUMES). 2. +. .

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STOICHIOMETRY

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  1. STOICHIOMETRY

  2. What is it? • Stoichiometry is the science of measuring the quantitative proportions or mass ratios in which chemical elements stand to one another. • BASICALLY…IT IS THE STUDY OF THE RELATIONSHIP BETWEEN THE MASSES (SOMETIMES VOLUMES).

  3. 2 +  How many pieces of bread are required to make a sandwich with 14 pieces of ham? (1 slice of ham per sandwich)

  4. RELATIONSHIPS MOLE TO MOLE MOLE TO MASS MASS TO MOLE MASS TO MASS

  5. Moles to Moles • Question? • How many moles of lithium hydroxide are required to react with 20 moles of CO2? • CO2(g) + LiOH(s) Li2CO3(s) + H2O(l)

  6. √ for a balance equation • CO2(g) + LiOH(s) Li2CO3(s) + H2O(l) • 1 C 1 C 3 O 4 O 1 Li 2 Li 1 H 2 H

  7. If not, balance it! • CO2(g) + 2 LiOH(s) Li2CO3(s) + H2O(l) • 1 C 1 C 43 O 4 O 21 Li 2 Li 2 1 H 2 H

  8. Find mole ratio • CO2(g) + 2LiOH(s) Li2CO3(s) + H2O(l) • mol LiOH mol CO2 • Use the coefficients as the mole ratio • 2 mol LiOH 1 mol CO2

  9. Convert moles given to moles wanted • Give 20 moles of CO2 • 20 mol CO2 2 mol LiOH 1 mol CO2 = 40 mol LiOH That's the answer!!

  10. Mole to Mass • Question? • What is the mass of carbon dioxide, in grams, is needed to react with 3.00 mol of H2O in the photosynthesis reaction? • 6CO2 + 6 H2O C6H12O6 + 6 O2

  11. √ for a balance equation • 6CO2 + 6 H2O C6H12O6 + 6 O2 It is balanced!!

  12. Find mole ratio • 6CO2 + 6 H2O C6H12O6 + 6 O2 • mol CO2 mol H2O • Use the coefficients as the mole ratio • 6 mol CO2 6 mol H2O

  13. Convert moles given to moles wanted • Given 20 moles of CO2 • 3 mol H2O 6 mol CO2 6 mol H2O = 3 mol CO2 But you want grams not moles!

  14. Convert the moles to grams. • 3.00 mol CO2 44.01g CO2 mol CO2 = 132 g CO2 That's the answer!!

  15. Mass to Mole • Question? • The following reaction is run using 824 g of NH3, how many moles of NO are formed? • NH3 + O2 NO + H2O

  16. √ for a balance equation • NH3 + O2 NO + H2O • It’s not, so balance it! • 4NH3 +5O24 NO + 6H2O

  17. Given grams convert to moles • 824 g NH3 1mol NH3 17.04 g NH3 = 48.4 mol NH3 But you want grams not moles!

  18. Find mole ratio • 4NH3 +5O24 NO + 6H2O • mol NO mol NH3 • Use the coefficients as the mole ratio • 4 mol NO 4 mol NH3

  19. Convert moles to moles wanted • 48.4 mol NH3 4 mol NO 4mol NH3 = 48.4 mol NO That's the answer!!

  20. Mass to Mass • Do everything like the last problem BUT add ONE STEP!!! • Question? • How many grams of NO are formed?

  21. Take the 48.4 mol NO and convert it to grams. • 48.4 mol NO 30.01g NO 1 mol NO = 1452.48g NO That's the answer!!

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