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Gravimetric Stoichiometry

Gravimetric Stoichiometry. Stoichiometry. a measure of the relative proportions of the elements that take part in a chemical reaction 4 Al (s)  +  3 O2 (g)  = 2 Al2O3 (s) 6.49 g        ? mol                                26.98 g/mol                                      . Stoichiometry.

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Gravimetric Stoichiometry

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  1. Gravimetric Stoichiometry

  2. Stoichiometry a measure of the relative proportions of the elements that take part in a chemical reaction 4 Al (s)  +  3 O2 (g)  = 2 Al2O3 (s)6.49 g        ? mol                               26.98 g/mol                                      

  3. Stoichiometry a measure of the relative proportions of the elements that take part in a chemical reaction 4 Al (s)  +  3 O2 (g)  = 2 Al2O3 (s)6.49 g        ? mol                               26.98 g/mol                                       nAl = m/M = 6.49g/26.98g/mol = 0.2405485 mol nO2 = nAl x mole ratio

  4. Stoichiometry a measure of the relative proportions of the elements that take part in a chemical reaction 4 Al (s)  +  3 O2 (g)  = 2 Al2O3 (s)6.49 g        ? mol                               26.98 g/mol                                            nAl = m/M = 6.49g/26.98g/mol = 0.2405485 mol nO2 = nAl x mole ratio 0.2405485 mol Al x 3 mol O2 4 mol Al 0.1804114 mol O2 0.180 mol O2 *example from http://www.cdli.ca/courses/chem2202/unit01_org02_ilo03/b_activity.html

  5. Gravimetric Stoichiometry Gravimetric stoichiometry is stoichiometry with the answer expressed in mass. nAl2O3 = nO2 x mole ratio =0.1804 mole O2 x 2 mol Al2O3 3 mol O2 = 0.1202666 mol Al2O3

  6. Gravimetric Stoichiometry Gravimetric stoichiometry is stoichiometry with the answer expressed in mass. nAl2O3 = nO2 x mole ratio =0.1804 mole O2 x 2 mol Al2O3 3 mol O2 = 0.1202666 mol Al2O3 mAl2O3 = n x M = 0.1202666 mol x 101.96 g/mol =12.262389g =12.26g of Al2O3 *example from http://www.cdli.ca/courses/chem2202/unit01_org02_ilo03/b_activity.html

  7. Gravimetric Stoichiometry 1) Which word is most closely associated with meaning of the term gravimetric? A ) density B ) mass C ) mole D ) volume 2)  Which device is best suited to obtaining a specific mass of a chemical species? A ) balance B ) beaker C ) flask D ) graduated cylinder

  8. Gravimetric Stoichiometry 1) Which word is most closely associated with meaning of the term gravimetric? A ) density B ) mass C ) mole D ) volume 2)  Which device is best suited to obtaining a specific mass of a chemical species? A ) balance B ) beaker C ) flask D ) graduated cylinder

  9. Gravimetric Stoichiometry 1) Which word is most closely associated with meaning of the term gravimetric? A ) density B ) mass C ) mole D ) volume 2)  Which device is best suited to obtaining a specific mass of a chemical species? A ) balance B ) beaker C ) flask D ) graduated cylinder

  10. Gravimetric Stoichiometry 3) What mass of aluminum oxide can be produced from the complete reaction of 0.482 mol of oxygen gas? 4Al(s) + 3O(g) = 2Al3O2 A ) 13.8 g B ) 32.8 g C ) 49.1 g D ) 73.7 g 4) Calculate the number of moles of hydrogen gas that should be produced from the complete reaction of 3.93g of zinc metal. Zn(s) + 2HCl(aq) = H2(g) + ZnCl2(aq) A ) 0.0601 mol B ) 3.93 mol C ) 16.6 mol D ) 257 mol

  11. Gravimetric Stoichiometry 3) What mass of aluminum oxide can be produced from the complete reaction of 0.482 mol of oxygen gas? 4Al(s) + 3O(g) = 2Al3O2 A ) 13.8 g B ) 32.8 g C ) 49.1 g D ) 73.7 g 4) Calculate the number of moles of hydrogen gas that should be produced from the complete reaction of 3.93g of zinc metal. Zn(s) + 2HCl(aq) = H2(g) + ZnCl2(aq) A ) 0.0601 mol B ) 3.93 mol C ) 16.6 mol D ) 257 mol

  12. Gravimetric Stoichiometry 3) What mass of aluminum oxide can be produced from the complete reaction of 0.482 mol of oxygen gas? 4Al(s) + 3O(g) = 2Al3O2 A ) 13.8 g B ) 32.8 g C ) 49.1 g D ) 73.7 g 4) Calculate the number of moles of hydrogen gas that should be produced from the complete reaction of 3.93g of zinc metal. Zn(s) + 2HCl(aq) = H2(g) + ZnCl2(aq) A ) 0.0601 mol B ) 3.93 mol C ) 16.6 mol D ) 257 mol

  13. Gravimetric Stoichiometry Use the following information to answer questions # 5-7: The Chemistry recipe for S’mores is : 2 graham crackers + 4 marshmallows + 3 pieces of chocolate →1 S’more You have the following supplies in your pantry: 50 graham crackers, 80 marshmallows, 65 pieces of chocolate. 5. What is limiting reactant? A. The graham crackers B. The marshmallows C. The pieces of chocolate. D. Chocolate and the graham crackers both limit the amount of S’mores 6. How many S’mores can you make? A. 25 B. 21 C. 20 D. 67 7. If you borrowed 10 graham crackers, 20 marshmallows, and 4 pieces of chocolate from your neighbor, and added these to your original amount, how many total S’mores could you make? A. 30 B. 25 C. 23 D. 78

  14. Gravimetric Stoichiometry Use the following information to answer questions # 5-7: The Chemistry recipe for S’mores is : 2 graham crackers + 4 marshmallows + 3 pieces of chocolate →1 S’more You have the following supplies in your pantry: 50 graham crackers, 80 marshmallows, 65 pieces of chocolate. 5. What is limiting reactant? A. The graham crackers B. The marshmallows C. The pieces of chocolate. D. Chocolate and the graham crackers both limit the amount of S’mores 6. How many S’mores can you make? A. 25 B. 21 C. 20 D. 67 7. If you borrowed 10 graham crackers, 20 marshmallows, and 4 pieces of chocolate from your neighbor, and added these to your original amount, how many total S’mores could you make? A. 30 B. 25 C. 23 D. 78

  15. Gravimetric Stoichiometry Use the following information to answer questions # 5-7: The Chemistry recipe for S’mores is : 2 graham crackers + 4 marshmallows + 3 pieces of chocolate →1 S’more You have the following supplies in your pantry: 50 graham crackers, 80 marshmallows, 65 pieces of chocolate. 5. What is limiting reactant? A. The graham crackers B. The marshmallows C. The pieces of chocolate. D. Chocolate and the graham crackers both limit the amount of S’mores 6. How many S’mores can you make? A. 25 B. 21 C. 20 D. 67 7. If you borrowed 10 graham crackers, 20 marshmallows, and 4 pieces of chocolate from your neighbor, and added these to your original amount, how many total S’mores could you make? A. 30 B. 25 C. 23 D. 78

  16. Gravimetric Stoichiometry Use the following information to answer questions # 5-7: The Chemistry recipe for S’mores is : 2 graham crackers + 4 marshmallows + 3 pieces of chocolate →1 S’more You have the following supplies in your pantry: 50 graham crackers, 80 marshmallows, 65 pieces of chocolate. 5. What is limiting reactant? A. The graham crackers B. The marshmallows C. The pieces of chocolate. D. Chocolate and the graham crackers both limit the amount of S’mores 6. How many S’mores can you make? A. 25 B. 21 C. 20 D. 67 7. If you borrowed 10 graham crackers, 20 marshmallows, and 4 pieces of chocolate from your neighbor, and added these to your original amount, how many total S’mores could you make? A. 30 B. 25 C. 23 D. 78 *questions from http://k-12.pisd.edu/schools/pshs/science/Chem/LR_Study_Guide.pdf

  17. Resources For those who need extra help with this subject please see these links or resources. • http://k-12.pisd.edu/schools/pshs/science/Chem/LR_Study_Guide.pdf • http://www.cdli.ca/courses/chem2202/unit01_org02_ilo03/b_activity.html • Chemistry Alberta 20-30 Pages 286 - 293

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