<p>Name ______Period ______</p><p>Atoms, molecules, ions, and formula units to Moles Pack</p><p>Directions: Show all of your work, including units throughout the problem and round your answers to the correct number of significant figures.</p><p>1. How many moles of K are there in 1.70 x 1022 atoms of potassium?</p><p>2. How many atoms of calcium are there in a 0.292 mole sample of calcium?</p><p>3. How many molecules of N2O are there in a 0.87 mole sample of N2O?</p><p>4. How many moles of Mn+2 are there in a 1.56 x 1023 ion sample of Mn+2?</p><p>24 5. Convert 6.47 x 10 molecules of CO2 to moles of CO2</p><p>6. How many formula units of NaCl are there in a 1.65 mole sample of NaCl?</p><p>7. How many moles of calcium nitrate are there in a 4.62 x 1023 formula unit sample of </p><p>Ca(NO3)2?</p><p>1 8. How many ions of nitride, N–3, are present in a 0.522 mole sample of N–3?</p><p>9. How many moles of N are there in 3.67 x 1022 atoms of nitrogen?</p><p>10. How many atoms of iron are there in a 1.25 sample of iron?</p><p>11. How many molecules of SF6 are there in a 1.32 mole sample of SF6?</p><p>12. How many moles of Ca+2 are there in a 3.77 x 1020 ion sample of Ca+2?</p><p>24 13. Convert 8.98 x 10 molecules of H2O to moles of H2O</p><p>14. How many formula units of SrF2 are there in a 0.65 mole sample of SrF2?</p><p>15. How many moles of Potassium Phosphate are there in a 2.05 x 1023 formula unit sample of Potassium Phosphate?</p><p>16. How many ions of Sulfide, S–2, are present in a 0.251 mole sample of S–2?</p><p>2 Grams to moles Pack</p><p>Directions: Show all of your work, including units throughout the problem and round your answers to the correct number of significant figures.</p><p>1. How many moles are there in 18.70 grams of sodium?</p><p>2. How many atoms of sodium are there in a 0.075 mole sample of sodium?</p><p>3. How many grams of sulfur are there in a 0.439 mole sample of sulfur?</p><p>4. How many moles of Mn are there in a 7.54 g sample containing Mn?</p><p>22 5. Convert 9.50 x 10 molecules of CO2 to moles.</p><p>6. How many formula units of NaCl are there in a 1.38 mole sample of NaCl?</p><p>7. How many moles are there in a 55.2 gram of nitrogen?</p><p>3 8. How many grams of Helium are present in a 3.21 mol sample of Helium?</p><p>9. How many moles of Cu atoms are in 15.7 grams of Cu atoms?</p><p>10. How many moles of Li atoms in 25.7 grams of Li atoms?</p><p>11. How many ions of sulfur are there in 25.0 mol sample of sulfur anions?</p><p>12. How many moles of C atoms are there in 25.0 grams of C atoms?</p><p>13. What is the mass of 0.984 moles of Mn atoms?.</p><p>14. How many atoms of sulfur are in 2.284 moles of S atoms? </p><p>15. What is the mass of 0.444 moles of As atoms?</p><p>4 Molar Mass and more mole conversion Pack</p><p>Determine the molar mass of the following:</p><p>1. H2O 2. Ti(MnO4)4</p><p>3. (NH4)2SO4 4. Fe3N2</p><p>Solve the problems below. Show all Work</p><p>1. Calculate the moles of CuCl2 in 157 gram sample of CuCl2.</p><p>2. Calculate the moles of Na2O in 25.7 gram sample of Na2O.</p><p>3. Calculate the mass in grams of MnO2 in 0.984 moles of MnO2.</p><p>4. Calculate the moles of SO3 molecules in 170 grams of SO3 molecules.</p><p>5 5. Calculate the mass in grams of 2.284 moles of S2Cl2. </p><p>6. Calculate the mass of 0.444 mole sample of O2.</p><p>7. How many water molecules are there in 120.0 gram sample of water?</p><p>8. What is the mass of 5.8 X 1023 formula units of Calcium chloride?</p><p>9. Calculate the mass of 2.126 moles of aluminum chloride.</p><p>10. Calculate the number of molecules of 0.125 moles of PI3.</p><p>6 Moles Review </p><p>1. How many grams are in 0.986 moles of barium sulfate, BaSO4?</p><p>2. How many moles are in 89.7g of Cl2 gas?</p><p>3. How many moles are in 79.6g of iron (II) phosphate Fe3(PO4)2?</p><p>4. How many grams are in 9.87 X1024 formula units of calcium sulfide, CaS?</p><p>2 22 5. How many moles of copper (II) chlorate, Cu(ClO3) are there in a 4.39 x 10 formula unit sample of copper (II) chlorate? </p><p>7 6. How many moles are in 6.89 X 1022 formula units of lead (IV) Sulfite </p><p>Pb(SO3)2?</p><p>7. How many formula units are in in 95.6 g of lead (IV) carbonate Pb(CO3)2?</p><p>8. How many moles are in 36.7 grams of Strontium Chloride (SrCl2)?</p><p>8 Percentage Composition Worksheet</p><p>Give the % composition of all elements in these compounds. Show all work!</p><p>1) ammonium sulfite % N ______</p><p>% H ______</p><p>% S ______</p><p>% O ______</p><p>2) aluminum acetate % Al ______</p><p>% C ______</p><p>% H ______</p><p>% O ______</p><p>3) sodium bromide % Na ______</p><p>% Br ______</p><p>4) copper (II) hydroxide % Cu ______</p><p>% O ______</p><p>% H ______</p><p>5) magnesium carbonate % Mg ______</p><p>% C ______</p><p>% O ______</p><p>9 Review Mole Problems</p><p>22 1. How many moles of copper (II) chlorate, Cu(ClO3)2 are there in a 4.39 x 10 formula unit sample of copper (II) chlorate? </p><p>How many grams of copper are in this sample of Cu(ClO3)2?</p><p>2. How many grams are in 0.986 moles of barium sulfate BaSO4?</p><p>3. How many grams of silver chloride are in 1.96 moles of silver chloride, AgCl?</p><p>4. How many moles of iron are in 79.6g of iron (II) phosphate Fe3(PO4)2?</p><p>5. How many grams of calcium are in 9.87 X1024 formula units of calcium sulfide, CaS?</p><p>10 Empirical Formulas Determine the empirical formula for the following compositions: 1. 88.8% copper, 11.2% oxygen </p><p>2. 40.0% carbon, 6.7% hydrogen, 53.3% oxygen</p><p>3. 92.3% carbon, 7.7% hydrogen</p><p>4. 70.0% iron, 30.0% oxygen</p><p>11 5. 5.88% hydrogen, 94.12% oxygen</p><p>Solve the problems below: 6. A compound is analyzed and found to contain 5.64g of magnesium and 16.36g of chlorine. Calculate the empirical formula. </p><p>7. A salt of barium is found to contain 17.14g of barium and 8.86g of chlorine. What is the simplest formula (empirical formula)?</p><p>12 Empirical & Molecular Formula Worksheet</p><p>Directions: Show all of your work in the following problems, and include units for molar mass, where necessary.</p><p>1) What’s the empirical formula of a molecule containing 65.5% carbon, 5.5% hydrogen, and 29.0% oxygen?</p><p>2) If the molar mass of the compound in problem 1 is 110 grams/mole, what’s the molecular formula?</p><p>3) What’s the empirical formula of a molecule containing 18.7% lithium, 16.3% carbon, and 65.0% oxygen?</p><p>4) If the molar mass of the compound in problem 3 is 73.8 grams/mole, what’s the molecular formula?</p><p>13 5) The molar mass for a compound is 228.0 g/mol. Determine the molecular formula for this compound when the empirical formula is C2H4O3. </p><p>6) The molar mass for a compound is 165.0 g/mol. Determine the empirical and molecular formulas for the compound when it contains 8.5 grams of nitrogen, 3.0 grams of hydrogen, and 21.8 grams of carbon.</p><p>7) Determine the empirical formula for a compound that contains 20.5% C, 2.5% H, 53.8%O, and the remaining percentage is nitrogen. If the molar mass of the compound is 595.0 g/mol, what is the molecular formula for the compound? </p><p>14 Chapter 8 Review SOLVE THE FOLLOWING MOLAR CONVERSION & MOLARITY PROBLEMS: 21 1. How many grams would 8.1 x 10 molecules of sucrose (C12H22O11) weigh?</p><p>2. How many grams of AgNO3 are in 0.80mol of AgNO3? 3. How many moles are in 53.8 g of magnesium chloride?</p><p>4. How many formula units of SrSO4 are in 23.1 grams?</p><p>5. How many formula units are in 0.845 moles of NaNO3? 6. How many molecules are in 50.0 g of sulfur trioxide?</p><p>SOLVE THE FOLLOWING PERCENTAGE COMPOSITION PROBLEMS:</p><p>7. Find the percentage composition of carbon in sucrose (C12H22O11). 8. Find the percentage composition of nitrogen in nitrogen monoxide.</p><p>SOLVE THE FOLLOWING EMPIRICAL & MOLECULAR FORMULA PROBLEMS: 9. Find the empirical formula of a compound that contains 75% carbon and 25% hydrogen. 10. Find the empirical formula of a compound that contains 9.03 g magnesium and 3.48 g of nitrogen.</p><p>11. The empirical formula of a compound is NO2. Its molecular mass is 92 g/mol. What is its molecular formula?</p><p>12. Glucose has an empirical formula of CH2O. Find its molecular formula if its molecular mass is 180.0 g/mol. 13. A compound is composed of 34.2% sodium, 17.7% carbon, and 47.6% oxygen. Find its empirical formula. If its molecular mass is 134 g/mol, find its molecular formula.</p><p>15</p>