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Catalyst:

Catalyst:. Balance the following chemical equation. Pb (NO 3 ) 2 + AlCl 3 → PbCl 2 + Al(NO 3 ) 3 New seats on front board Objectives: Calculate the moles or grams of a substances in a given equation. Determine the percent composition of elements in a compound. Homework:

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Catalyst:

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  1. Catalyst: Balance the following chemical equation. Pb(NO3)2+ AlCl3→ PbCl2+ Al(NO3)3 New seats on front board Objectives: Calculate the moles or grams of a substances in a given equation. Determine the percent composition of elements in a compound. Homework: C.7/C.10 worksheet

  2. Warm-up Balance the following chemical equation. Pb(NO3)2 + AlCl3→ PbCl2 + Al(NO3)3 1 Pb 1 2 NO3 3 1 Al 1 3 Cl 2

  3. Warm-up Balance the following chemical equation. 3 Pb(NO3)2+ AlCl3→ PbCl2 + 2 Al(NO3)3 3 Pb 1 6 NO3 6 1 Al 2 3 Cl 2

  4. Warm-up Balance the following chemical equation. 3 Pb(NO3)2+ 2 AlCl3→ 3 PbCl2+ 2 Al(NO3)3 3 Pb 3 6 NO3 6 2 Al 2 6 Cl 6

  5. Converting grams to moles To convert grams to moles: • Write down your given amount of grams. • Calculate the molar mass. • Put the grams part of the molar mass on bottom, put the moles part (1 mol) on top.

  6. Converting grams to moles Ex: • How many moles is 50 grams of magnesium? • 270 grams of methanol (CH3OH) is how many moles?

  7. Converting moles to grams To convert moles to grams: • Write down your given amount of moles. • Calculate the molar mass. • Put the grams part of the molar mass on top, put the moles part (1 mol) on bottom.

  8. Converting moles to grams Ex: • How many grams is 3 moles of gold? • .6 moles of baking soda (NaHCO3) is how many grams of baking soda?

  9. Equations and Molar Relationships CuO (s) + C(s) → Cu(s) + CO2 2 CuO (s) + C(s) → 2 Cu(s) + CO2 2 CuO (s) + C(s) → 2 Cu(s) + CO2 2 formula units CuO 1 atom C 2 atoms Cu 1 molecule CO2 1mol C 2 molCuO 2 mol Cu 1 mol CO2

  10. 2 CuO (s) + C(s) → 2 Cu(s) + CO2 2 molCuO = 2 mol Cu 2 molCuO = 1 mol CO2 2 molCuO = 1 molC 1 mol C = 2 molCu 1 mol C = 1 molCO2 2 molCu = 1 mol CO2 These will be your conversion factors.

  11. Review & Examples • We have two main places to get conversion factors: • Molar mass (grams <-> moles) • Coefficients (moles <-> moles)

  12. Problem Solving Flow Chart g X → g Y mol X → mol Y → Use molar mass of X; calculate it using info from periodic table. Use molar mass of Y; calculate it using info from periodic table. Use coefficients from balanced equation.

  13. 2 CuO (s) + C(s) → 2 Cu(s) + CO2 We want to produce 35 mol Cu. • How many moles of copper (II) oxide do we need? • How many moles of carbon do we need?

  14. 2 CuO (s) + C(s) → 2 Cu(s) + CO2 We want to produce 500 g CO2. • How many moles of copper (II) oxide do we need? • How many moles of carbon do we need?

  15. 2 CuO (s) + C(s) → 2 Cu(s) + CO2 We want to produce 7,345 g Cu. • How many grams of carbon do we need? • How many grams of CO2 will be produced in the process?

  16. 2 CuO (s) + C(s) → 2 Cu(s) + CO2 We want to produce 7,345 g Cu. • How many grams of CuO do we need? 9,194.3 g CuO

  17. C.9 Percent Composition Turn to pg. 167. If you had 1 mole of each of the minerals, how many copper atoms would you have in each mole? Which mole would be the heaviest? Cu2S 159.17 g/mol CuFeS2 183.54 g/mol Cu2CO3(OH)2 221.126 g/mol Which one has the most copper for every gram of the mineral?

  18. C.9 Percent Composition • Percent composition gives the percentage (by mass) of an element in a substance. • If you are given a formula, use the molar mass.

  19. Cu2S CuFeS2 Cu2CO3(OH)2

  20. Ex: A post-1982 penny with a mass of 2.5 g is composed of 2.4375 g zinc and 0.0625 g copper. What is the percent composition of each element? 97.5% zinc 2.5% copper

  21. Ex: Find the percent composition of each element in glucose, C6H12O6

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