Mol Practice 1. How many particles of sucrose are in 3.5 moles of sucrose? Molecules of sucrose. 2. Determine the number of atoms in 2.50 moles of Zn. 3. Given 3.25 mol AgNO 3, determine the number of the formula unit. Mol- 1
4. Calculate the number of molecules in 11.5 moles of H 2 O 5. Zinc is used as a corrosion- resistant coating on iron and steel. It is also an essential trace element in your diet. Calculate the number of moles that contain 4.50 x 1024 atoms of Zinc. 6. How many moles contain each of the following: 5.75 x 1024 atoms Al. 3.75 x 1024 atoms CO 2. 3.58 x 1025 formula unit of ZnCl 2 2.50 x 1026 atoms Fe 7. Manganese has an atomic mass of 54.94 AMU. Therefore the molar mass is 54.94 g/mol. Using molar mass in your lab you need 3 moles of Manganese (Mn) for a chemical reaction. Mol- 2
8. Chromium Cr is a transition element used as a coating on metals and in steel alloys to control corrosion. Calculate the mass in grams of 0.045 moles of Chromium. 9. Determine the mass in grams of each of the following. 3.57 mol Al 42.6 mol Si 3.45 mol Co 2.45 mol Zn 10. Calcium is the fifth most abundant element on earth, is always found combine with other element because of its high reactivity. How many moles of calcium are in 525 grams of calcium (Ca) 11. Determine the number of moles in each of the following. 25.5 grams Ag 300 grams S 125 grams Zn 1 kg Fe. Mol- 3
12. Gold is one of a group of metals called coinage metal (copper, silver and gold). How many atoms of gold Au are in a pure gold nugget with a mass of 25 grams. 12. How many atoms are in each of the following samples?. 55.2 grams Li 0.230 grams of Pb 11.5 grams of Hg 45.6 grams of Si 0.12 Kg of Ti 12. Helium is an unreactive noble gas often found in underground deposits mixed with methane. The mixture is separate by cooling the gaseous mixture until all, except the helium has liquified. A party balloon contain 5.5 x 10 22 atoms of Helium gas. What is the mass in grams of the Helium? 13. What is the mass in grams of each of the following? 6.02 x 10 24 atoms of Bi 1 x 10 24 atoms of Mn 3.4 x 10 22 atoms of He 1.50 x 10 15 atoms of N 1.50 x 10 15 atoms of uranium Mol- 4
14. Aluminum oxide (Al 2 O 3 ), often called alumina, is the principal raw material for the production of aluminum; determine the moles of aluminum ions (Al 3+ ) in 1.25 moles of aluminum oxide. 15. Determine the number of moles of chloride ions in 2.50 mol ZnCl 2 16. Calculate the number of moles of each element in 1.25 mol of glucose (C 6 H 12 O 6 ). 17. Determine the number of moles of sulfate ions present in 3 mol in Iron II sulfate Mol- 5
18. How many moles of oxygen atoms are present in 5 moles of diphosphorous pentoxide.. 19. Calculate the number of moles of hydrogen atoms in 11.5 mol water. 20. Determine the molar mass of potassium chromate K 2 CR0 4 21. Determine the molar mass of each of the following ionic compounds NaOH CaCl 2 KC 2 H 3 O 2 Sr(NO 3 ) 2 (NH 4 ) 3 PO 4 Mol- 6
22. Determine the molar mass of each of the following covalent compounds C 2 H 5 OH C 12 H 22 O 11 HCN CCl 2 H 2 O 23. Odor in garlic is due to a compound allyl sulfide (C 6 H 5 ) 2 S. What is the mass of 2.50 moles of allyl sulfide 24. What is the mass of 3.25 moles of sulfuric acid H 2 SO 4. 25. What is the mass of 4.35 x 10-2 moles of zinc II chloride Mol- 7
26. How many grams of potassium permanganate are in 2.55 moles? 27. Calcium hydroxide Ca(OH) 2 is used to remove sulfur dioxide from the exhaust gasses emitted by power plants and for softening water by the elimination of Ca + and Mg 2+ ions. Calculate the numbers of moles of Calcium hydroxide in 325 grams 28. Determine the number of moles present in each of the following? 226 grams of AgNO 3 6.5 grams of ZnSO 4 35 grams of HCl 25 grams of Fe 2 O 3 254 grams of PbCl 4 29. Aluminum chloride is used in refining petroleum and manufacturing rubber and lubricants. A sample of aluminum chloride (AlCl 3 ) has a mass of 35.6 grams. How many aluminum ions are present? How many chloride ions are present? What is the mass in grams of formula unit of AlCl 3 Mol- 8
30. A sample of silver chromate (Ag 2 CrO 4 ) has a mass of 25.8 grams How many Ag + ions are present? How many CrO 4 2- ions are present? What is the mass in grams of one formula unit of Ag 2 CrO 4 31. What mass of sodium chloride contains 4.59 x 10 24 formula unit. 32. A sample of ethanol (C 2 H 5 OH) has a mass of 45.6 grams. How many carbon atoms does the sample contain? How many hydrogen atoms are present? How many hydrogen atoms are present? 33. A sample of sodium sulfite has a mass of 2.25 grams. How many Na + ions are present? How many SO 3 2- ions are present? What is the mass in grams of one formula unit of sodium sulfite? Mol- 9
34. A sample of carbon dioxide has a mass of 52 grams How many carbon atoms are present? How many oxygen atoms are present? What is the mass in grams of one formula unit of carbon dioxide? Mol- 10