b. N 2 H 4 c. aluminum oxalate d. acetic acid e. arsenic PART 2: MOLAR MASS 2. Determine the molar mass for each of the following. a. ZnI 2 b.

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1 CHEMISTRY DISCOVER UNIT 5 LOTS OF PRACTICE ON USING THE MOLE!!! PART 1: ATOMIC MASS, FORMULA MASS, OR MOLECULAR MASS 1. Determine the atomic mass, formula mass, or molecular mass for each of the following (indicate if it is either a(n) atomic mass, formula mass, or molecular mass). a. BaSO 4 b. N 2 H 4 c. aluminum oxalate d. acetic acid e. arsenic PART 2: MOLAR MASS 2. Determine the molar mass for each of the following. a. ZnI 2 b. NO 2 c. Iron(II) nitrate 0

2 PART 3: MOLE CONVERSIONS Grams to Moles Ex. Determine the amount of moles in 40.0 grams Mg. mass (grams molar mass mass moles (grams) molar mass moles molar mass 6.02x atoms molecules particles Set up: 3. Convert the following to moles 4.50 grams Fe grams C 6 H x grams Rb grams barium chloride grams ammonium sulfide 15.6 grams (NH 4 ) 2 SO 4 1

3 Moles to Grams Ex. Determine the mass of 6.43 moles C 2 H 4 mass (grams Set up: molar mass moles 4. Convert the following to grams moles Cr moles CO x moles S 35,067 moles beryllium nitrate 32,000 moles beryllium nitride 2.00 moles Ne 2

4 Moles to Atoms or Molecules or Particles Ex. Determine the number of particles in moles NaHCO 3 Set up: moles 6.02 x atoms molecules particles 5. Convert the following to atoms, molecules or particles 5.6 x 10 3 moles Ba 7.64 x 10-1 moles dihydrogen monoxide moles CaCO 3 4,560 moles cobalt (II) dichromate 8.21 moles XeF moles NO 3

5 Atoms or Molecules or Particles to Moles Ex. Determine the mole quantity in of 5.6 x atoms Ag. Set up: moles 6.02 x atoms molecules particles 6. Convert the following to moles 4.98 x particles MoBr x atoms Ra x atoms Si 5.1 x molecules H 2 O x molecules P 5 S 7 7 x particles MgO 4

6 Grams to Atoms or Molecules or Particles Ex. How many molecules of alcohol are there in a standard can of beer if there are 21.3 g of C 2 H 6 O? mass (grams Set up: molar mass moles 6.02 x atoms molecules particles 7. Convert the following to atoms, molecules, or particles grams Au grams NH 4 OH 54.5 grams Na 2 Se 65.6 grams At grams SrSO grams calcium bromide 5

7 Atoms or Molecules or Particles to Grams Ex. What is the mass of x molecules C 3 H 8? mass (grams Set up: molar mass moles 6.02 x atoms molecules particles 8. Convert the following to grams 4.56 x atoms Ag x molecules C 6 H 12 O x particles BeO 7.2 x particles Sn(CrO 4 ) x atoms Hg 1.54 x atoms Po 6

8 PART 4: PERCENT COMPOSITION 9. Determine the percent composition of the elements in each of the following compounds. a. barium arsenate b. CH 3 COOH c. Ammonium carbonate PART 5: EMPIRICAL & MOLECULAR FORMULAS 10. Determine the empirical formula for each of the following: a. CH 3 COOH b. C 6 H 12 O 6 c. N 2 O 10 F Determine the empirical formula and the molecular formula from the following percent compositions and molar mass data % N, 69.55% O, molar mass = 92 g/mol 9.93% C, 58.64% Cl, 31.43% F, molar mass = 121 g/mol 40.00% C, 6.71% H, 53.29% O, molar mass = 60 g/mol 7

9 CHALLENGE QUESTIONS 12. Why is it proper to speak of the molecular mass of water but not of the molecular mass of sodium nitrate? 13. The recommended daily allowance (RDA) of iron in your diet is 15 mg. How many moles is this? How many atoms? 14. Which has more atoms, one mole of gold or one mole of lead? 15. How many hydrogen atoms are there in 546 grams of water? 16. How many moles of NH + 4 ion and PO 3-4 ions in 4.5 moles ammonium phosphate? 17. How many moles of each atom are contained in 876 moles carbon tetrachloride? 18. Lithium fluoride is used as a flux when welding or soldering aluminum. How many grams of lithium are in 1.00 lb (454 g) of lithium fluoride? 19. Molybdenum is an important element in making steel alloys. It comes from an ore called wulfenite, PbMoO 4. What mass of pure wulfenite must be treated to obtain 201 kg Mo? 20. How many grams of the insecticide calcium chlorate must be measured if a sample is to contain 4.17 grams chlorine? 21. Explain why C 6 H 10 must be a molecular formula, while C 7 H 10 could be a molecular formula, an empirical formula or both? 8

10 CHEMISTRY DISCOVER Unit 5 Mole Activity Look at the following samples in the provided flasks of common materials and their quantities. Convert their quantities to the amount asked. Tin grams Sn convert to moles Table Sugar mole C 12 H 22 O 11 convert to grams Moth Balls 1.35 x molecules C 10 H 8 (naphthalene) convert to moles Ice Melting Salts mole CaCl 2 convert to particles Baking Soda 23.0 grams NaHCO 3 convert to particles Water 2.5 x molecules of water convert to grams 9

11 CHEMISTRY DISCOVER UNIT 5 Practice Problems 1. Calculate the amount of molecules in 35.5 grams citric acid (acid found in citrus fruits) C 6 H 8 O What is the mass of 4.59x particles of MgO? 3. Is sodium nitrate a molecule or a particle? Explain. 4. Calculate the formula mass of ammonium phosphate. 5. Calculate the molecular mass of C 2 H 4 OH. 6. Which of the following compound is the term molecular mass better suited than the term formula mass? F 2 CaO K 3 N NaOH RbOH 7. Calculate the number of moles in grams of Al(OH) Calculate the molar mass of N 2 S 9. What is the mass of mole of titanium(iv) oxide? 10. How many atoms are in 18.8 mol Rb? 11. Which of the following statements is incorrect? Molecular mass is expressed in amu Formula mass is expressed in amu Atomic mass is expressed in grams/atom Molar mass is expressed in grams/mole 12. Calculate the mass of 6.78 x particles Mg 3 (PO 4 ) How many molecules are in mol NH 3? 14. How many atoms are in 44.3 moles of barium? 15. Calculate the number of atoms in 566 grams of carbon. 16. How many grams are in mol of CaH 2? 17. How many moles are in 6.27 x particles of NaNO 3? 18. Calculate the mass of 7.99 x particles Fe 2 O Find the percent composition of ammonium nitrate. 20. 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 g/mol). 10

12 CHEMISTRY DISCOVER UNIT 5 Answers LOTS OF PRACTICE ON USING THE MOLE!!! 1. a. BaSO amu (Formula Mass) b. N 2 H amu (Molecular Mass) c. aluminum oxalate amu (Formula Mass) d. acetic acid 60.0 amu (Molecular Mass) e. arsenic 74.9 amu (Atomic Mass) 2. a. ZnI g/mol b. NO g/mol c. Iron(II) nitrate g/mol grams Fe = mol Fe grams C 6 H 6 = 8.10 x 10-3 mol C 6 H x grams Rb = 1.9 x mol Rb grams barium chloride = mol BaCl grams ammonium sulfide = mol (NH 4 ) 2 S 15.6 grams (NH 4 ) 2 SO 4 = mol (NH 4 ) 2 SO moles Cr = g Cr moles CO 2 = g CO x moles S = 1.46 x g S 35,067 moles beryllium nitrate = 4,663,900 g Be(NO 3 ) 2 32,000 moles beryllium nitride = 1,800,000 g Be 3 N moles Ne = 40.2 g Ne x 10 3 moles Ba = 3.4 x atoms Ba 7.64 x 10-1 moles dihydrogen monoxide = 4.60 x molecules H 2 O moles CaCO 3 = x particles CaCO 3 4,560 moles cobalt (II) dichromate = 2.75 x particles CoCr 2 O moles XeF 4 = 4.94 x molecules XeF moles NO = 1.20 x molecules NO x particles MoBr 2 = mol MoBr x atoms Ra = 8.11 x 10-3 mol Ra x atoms Si = mol Si 5.1 x molecules H 2 O 2 = 8.5 mol H 2 O x molecules P 5 S 7 = mol P 5 S 7 7 x particles MgO = 1 mol MgO grams Au = x atoms Au grams NH 4 OH = 5.73 x particles NH 4 OH 54.5 grams Na 2 Se = 2.62 x particles Na 2 Se 65.6 grams At 2 = 9.40 x molecules At grams SrSO 4 = x particles SrSO grams calcium bromide = x particles CaBr x atoms Ag = 817 g Ag x molecules C 6 H 12 O 6 = g C 6 H 12 O x particles BeO = g BeO 7.2 x particles Sn(CrO 4 ) 2 = 4.2 x 10-7 g Sn(CrO 4 ) x atoms Hg = 1.07 x g Hg 1.54 x atoms Po = 5.35 g Po 9. a. barium arsenate 59.7% Ba, 21.7% As, 18.6% O b. CH 3 COOH 40.0% C, 53.3% O, 6.67% H c. Ammonium carbonate 29.2% N, 8.33% H, 12.5% C, 50.0% O 10. a. CH 3 COOH CH 2 O b. C 6 H 12 O 6 CH 2 O c. N 2 O 10 F 5 N 2 O 10 F % N, 69.55% O, molar mass = 92 g/mol = NO 2 / N 2 O % C, 58.64% Cl, 31.43% F, molar mass = 121 g/mol = CCl 2 F 2 / CCl 2 F % C, 6.71% H, 53.29% O, molar mass = 60 g/mol = CH 2 O / C 2 H 4 O Water is a covalent compound and sodium nitrate is an ionic compound x 10-4 mol Fe, 1.62 x atoms Fe 14. They have the same number of atoms because one mole is 6.02 x atoms for both x atoms H moles NH + 4 ions and 4.5 moles PO 3-4 ions mol C, 3504 mol Cl (3.50 x 10 3 mol Cl) g Li kg PbMoO g Ca(ClO 3 ) C 6 H 10 can be simplified to C 3 H 5 but C 7 H 10 can t. 11

13 CHEMISTRY DISCOVER Unit 5 Answers Mole Activity Look at the following samples in the provided flasks of common materials and their quantities. Convert their quantities to the amount asked. Tin grams Sn convert to moles mol Sn Table Sugar mole C 12 H 22 O 11 convert to grams 48.9 g C 12 H 22 O 11 Moth Balls 1.35 x molecules C 10 H 8 (naphthalene) convert to moles mol C 10 H 8 Ice Melting Salts mole CaCl 2 convert to particles 9.39 x particles CaCl 2 Baking Soda 23.0 grams NaHCO 3 convert to particles 1.65 x particles NaHCO 3 Water 2.5 x molecules of water convert to grams 75 grams water 12

14 CHEMISTRY DISCOVER UNIT 5 Answers In Class Practice 1. Calculate the amount of molecules in 35.5 grams citric acid (acid found in citrus fruits) C 6 H 8 O x molecules 2. What is the mass of 4.59x particles of MgO? 3.07 x 10 7 grams 3. Is sodium nitrate a molecule or a particle? Explain. Particle ionic compound 4. Calculate the formula mass of ammonium phosphate amu 5. Calculate the molecular mass of C 2 H 4 OH amu 6. Which of the following compound is the term molecular mass better suited than the term formula mass? F 2 CaO K 3 N NaOH RbOH 7. Calculate the number of moles in grams of Al(OH) mol 8. Calculate the molar mass of N 2 S g/mol 9. What is the mass of mole of titanium(iv) oxide? 3.91 g 10. How many atoms are in 18.8 mol Rb? 1.13 x atoms 11. Which of the following statements is incorrect? Molecular mass is expressed in amu Formula mass is expressed in amu Atomic mass is expressed in grams/atom Molar mass is expressed in grams/mole 12. Calculate the mass of 6.78 x particles Mg 3 (PO 4 ) x grams 13. How many molecules are in mol NH 3? x molecules 14. How many atoms are in 44.3 moles of barium? 2.67 x atoms 15. Calculate the number of atoms in 566 grams of carbon x atoms 16. How many grams are in mol of CaH 2? grams 17. How many moles are in 6.27 x particles of NaNO 3? 10.4 mol 18. Calculate the mass of 7.99 x particles Fe 2 O grams 19. Find the percent composition of ammonium nitrate. 35% N, 5% H, 60% O 20. 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 g/mol). Empirical: C 14 H 18 N 2 O 5 Molecular: C 14 H 18 N 2 O 5 13

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