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Drill:

Drill:. How many atoms are in 2.5 kg C 2 H 4 O 2 ?. Return Tests & Labs During Drill Review Tests, Labs & Drill. Discuss Importance of HW. CHM II HW. Review PP-10 Complete the attached worksheet (Stoichiometry 1) & turn it in tomorrow. Are There any questions on previous material?.

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Drill:

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  1. Drill: How many atoms are in 2.5 kg C2H4O2?

  2. Return Tests & Labs During DrillReview Tests, Labs& Drill

  3. Discuss Importance of HW

  4. CHM II HW • Review PP-10 • Complete the attached worksheet • (Stoichiometry 1) & turn it in tomorrow.

  5. Are There any questions on previous material?

  6. Stoichiometry • The quantitative study of chemical reactions

  7. Stoichiometric Steps • Set up & balance rxn • Change stuff given to moles • Change moles given to ask • Change what’s asked for to the proper unit

  8. Step 1 • Determine products of a reaction if they are not given • Balance the reaction

  9. Step 2 • Use molar conversion to change whatever is given to moles

  10. Step 3 • Use the molar ratio from the balanced reaction to convert the moles of what is given to the moles of what’s asked for.

  11. Step 4 • Use molar conversions to change the moles of what is asked for to the proper unit

  12. Calculate the volume of NH3 formed at STP when 6.00 kg of H2 react with excess N2 to form NH3

  13. Calculate the number of molecules of oxygen gas required to burn 3.5 ng of C5H10

  14. Calculate the mass of CO2 formed when 2.3 mg of C2H5OH is burned

  15. Drill: Calculate the mass of PbI2 formed when 66.2 g of Pb(NO3)2 is combined with excess KI.

  16. Review & Collect Drill & HW

  17. CHM II HW • Review PP-10. • Complete the attached worksheet (Stoichiometry 2) & turn it in tomorrow.

  18. Are there any questions on previous material?

  19. Calculate the mass of MgCO3 formed when 18.4 g of MgBr2 is combined with a solution containing excess K2CO3.

  20. Calculate the volume of CO2 formed at STP when 16.8 g of MgCO3 is decomposed creating CO2 & MgO.

  21. Limiting Reactant • The reactant that gets used up • The reactant that determines the amount of product formed

  22. Excess Reactant • The reactant that does not get used up

  23. Stoichiometry with Multiple Reagents • Perform same steps for all reactants • Choose least amount of product

  24. Calculate the mass of glucose (C6H12O6) formed when 880 g of carbon dioxide is combined with 720 g of water in photosynthesis

  25. Drill: Calculate the mass of BaSO4 formed when 104 g of BaCl2 is combined with 250 mL 1.00 M(mole/L) K2SO4

  26. Review & Collect Drill& HW

  27. Chm II HW • Review PP-10 • Work the problem attached to Poly’s website

  28. Are there any questions on previous material?

  29. Schedule: • Lab: Friday • Test: Next Week

  30. Calculate the # of molecules of NH3 formed when4.0 mg of H2 react with 1.12 mL of N2 gas at STP.

  31. Theoretical Yield • The amount determined through stoichiometry • The amount solved for on paper

  32. Experimental Yield • The amount obtained in the lab • Actual yield

  33. Percent yield % Yield = (Exp/Theo) x 100 %

  34. 68 g NH3 was obtained in lab when 140 g of N2 reacts with excess H2. Calculate percent yield.

  35. 510 g PH3 were obtained in the lab when 0.62 kg of P4 reacted with excess H2. Calculate percent yield.

  36. Drill: Determine the # of molecules of PH3 formed at STP when 1.24 g P4 reacts with 672 mL of H2:

  37. Review & Collect Drill &HW

  38. Collect Lab 3

  39. Chm II HW • Review PP-10 • Lab Tomorrow • Test Tues. or Wed.

  40. Are there any questions on previous material?

  41. Determine the volume of O2 released at STP when 32 kg of Fe2O3 is purified with an 80.0 % yield making Fe & O2

  42. Calculate the volume of oxygen gas at STP required to burn 12 kg of erythrose (C4H8O4)

  43. Calculate the mass of BaSO4 formed when 41.6 g of BaCl2 is added to 250 mL of 0.40 M K2SO4 giving a 50.0 % yield:

  44. Calculate the mass of CaSO4 formed when 2.00 g of calcium bromide is added to 75 mL of 0.40 M sodium sulfate:

  45. Drill: Determine the volume of CO2 formed at STP when 1.62 g Ca(HCO3)2 is decomposed forming CaO, CO2, & H2O:

  46. Review & Collect Drill & HW

  47. Did anyone miss the lab on Friday?

  48. CHM II HW • Study for the test tomorrow

  49. Are there any questions on previous material?

  50. Terms: Stoichiometry Percent yield Limiting Reactant Excess reactant Theoretical yield Experimental yield

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