NAME______

FORMULA STOICHIOMETRY WORKSHEET

(All work shown on separate sheet of paper!)

  1. Define stoichiometry
  2. Construct a mole map.
  3. What does the acronym STP mean?
  4. What is the mass, in kilograms, of Avogadro’s number of Olympic shot put balls if each one has a mass of 16.0 lbs.? How does this compare with the mass of Earth, 5.98 x 1024 kg?
  5. What is the mass of one paper clip? (Get a paper clip from Mr. Morrow and go to a balance.) What is the mass of a dozen paper clips? What is the mass of a gross of paper clips? What is the mass of a mole of paper clips
  6. Nitroglycerin is C3H5N3O9. What is the molarmass of nitroglycerin with appropriate units?
  7. What is the molar mass of lead (II) nitrate?
  8. A Penicillin molecule has a mass of 5.55 x 10-22 g. What is the molar mass of the molecule? Predict five elements that compose this large molecule of Penicillin
  9. Ahemoglobin molecule has a mass of 1.09 x 10-19 g. What is the molar mass of the molecule? What is the metallic element in this large molecule? What is the oxidation state (aka-charge) of this metal ion in this oxygen carrier?
  10. The formula of an acid is H2XO4. The mass of 0.0156 moles of the acid is 2.262 g. What is the atomic weight of X? Support your answer with calculations.
  11. A nickel weighs 5.10 g. It consists of 75% copper and 25% nickel. How many moles of copper are in the coin? How many atoms of nickel are in the coin?
  12. A 2013 penny has a mass of 2.489 g. How many atoms of copper and zinc are in the penny, if the penny is 97.5 % zinc and 2.5 % copper?
  13. A flask contains phosphoric acid and another contains sulfuric acid. If the mass of each acid in the container is 543.2 grams, how many moles of each acid are in the two containers?
  14. A weighing dish has 4.516 g of sodium hypochlorite and another weighing dish has 5.458 g of potassium perchlorate. Which dish contains more chlorine atoms? Support your answer with calculations.
  15. A student measures out 39.234 grams of potassium cyanide. Another student measures out 89.310 grams of potassium chromate. Which student has more potassium ions in there weighing dish?
  16. A balloon is filled with nitrogen dioxide at STP to a volume of 1.21 L, how many molecules are in the balloon
  17. What is its mass of the gas in the balloon in question #15?
  18. Morphine, an addictive drug, has the molecular formula C17H19NO3. How many molecules of compound are in a 60. mg tablet?
  19. Aspartame, an artificial sweetener, has the molecular formula C14H18N2O5. A diet Coke contains 131 mg of this substance per can. How many molecules of this compound are in the can?
  20. Calculate the percent by mass of phosphorus and chlorine in phosphorus trichloride.
  21. Lithium carbonate is used to treat manic depression. What is the percentage by mass of lithium ions in this compound?
  22. Hemoglobin has a molecular formula C2952H4664O832N812S8Fe4. What is the percent by mass of the element carbon is this compound?
  23. Define the termempirical formula and BRIEFLY list the steps in determining an empirical formula.
  24. Find the empirical formula for the oxide that contains 42.05 g of nitrogen and 95.95 g of oxygen.
  25. Determine the empirical formula of natural rubber that is 88.2% C and 11.8% H.
  26. The elemental analysis of an unknown organic compound contains: %C = 38.72, %H = 9.72, %O = 51.56. What is the empirical formula for this compound?
  27. A compound was analyzed and found to contain 13.5 g Ca, 10.8 g O, and 0.675 g H. What is the empirical formula of the compound? What is the IUPAC name of this compound?
  28. A student finds that 15.20 grams of nitrogen will react with 17.37 grams of oxygen to form a nitrogen “oxide” molecule. What is the empirical formula of this compound and how would you name this molecule?
  29. Define the term molecular formula and how is this term different from an empirical formula?
  30. A compound has an empirical formula of ClCH2and a molecular weight of 98.96 g/mol. What is its molecular formula?
  31. Styrene, a hydrocarbon with an empirical formula of CH, is used to make Styrofoam cups and insulation. Analysis shows the compound has a molecular mass of 104g/mol. What is the molecular formula of this compound?
  32. Caffeine has an elemental analysis of 49.48% carbon, 5.190% hydrogen, 16.47% oxygen, and 28.85% nitrogen. It has a molar mass of 194.19 g/mol. What is the molecular formula of caffeine?
  33. Styrene, a hydrocarbon with an empirical formula of CH, is used to make Styrofoam cups and insulation. Analysis shows the compound has a molecular mass of 104g/mol. What is the molecular formula of this compound?
  34. NutraSweet is 57.14% C, 6.16% H, 9.52% N, and 27.18% O. Calculate the empirical formula of NutraSweet and find the molecular formula. (The molar mass of NutraSweet is 294.30 g/mol)
  35. What is the difference between a hydrated compound and an anhydrous compound?
  36. A hydrate of calcium chloride has a formula CaCl2. x H2O. A 10.954 g sample is heated to a constant value of 5.549 g. What is the value of x?
  37. A 5.00 g sample of hydrated barium chloride, BaCl2· nH2O, is heated to drive off the water. After heating, 4.26 g of anhydrous barium chloride, BaCl2, remains. What is the value of n in the hydrate's formula?