Assessment
Chapter 5
SCH3UI/W - Chapter 5 Review Sheet
1. Ferrous gluconate, Fe(C6H11O7)2 is often used as an iron supplement in foods. What is the mass in
grams, of a single molecule of ferrous gluconate? 7.41 x 10-22 g
2. Calculate the mass, in grams, of one molecule of nickelous bromite. 4.69 x 10-22 g
3. Calculate the mass, in grams, of one molecule of ferric arsenate. 3.24 x 10-22 g
4. Calculate the mass, in grams, of 15.6 u. 2.59 x 10-23 g
5. Find the molar mass of iron(III) sulphate. 351.91 g/mol
6. Find the molar mass of copper(II) phosphate. 380.59 g/mol
7. A sample of ammonia NH3, contains 8.03x1026 molecules. How many moles of ammonia are present?
1.33 x 103 mol
8. A sample of methane CH4, contains 8.03x1026 molecules. How many moles of methane are present?
1.33 x 103 mol
9. A sample of glucose C6H12O6, contains 8.436 mol. How many molecules of glucose are present?
5.08 x 1024 mol.
10. A sample of nitrogen dioxide, contains 7.68 x 1025 molecules. How many moles of nitrogen dioxide are
present? 1.28 x 102 mol
11. A sample of platinum, Pt, contains 8.43 x 1025 atoms. How many moles of platinum are present?
1.40 x 102 mol
12. What is the mass of 7.55 moles of acetic acid CH3COOH? 4.53 x 102 g
13. What is the mass of 13.67 moles of ethanol C2H5OH? 6.3 x 102 g
14. Calculate the number of oxygen atoms in 15.0 g of calcium nitride. 0 atoms
15. What is the mass of oxygen molecules in 23.45 grams of plumbic bicarbonate? 9.98 g
16. What is the mass of 3.71 moles of ammonia, NH3? 63.22 g
17. What is the mass of 11.51 moles of water? 2.074 x 102 g
18. How many atoms of O are in a mixture containing 0.353 mol of H2O and 1.83 mol of C2H4O2?
2.42 x 1024 atoms
19. How many atoms of C are in a mixture containing 0.237 mol of CO2 and 2.38 mol of CaC2?
3.01 x 10 24 atoms
20. In a synthesis reaction, two moles of oxygen, O2, react with one mole of nitrogen, N2. Dinitrogen
tetroxide is produced. Calculate the mass of oxygen atoms that is needed to react with 24.0 g of N2.
54.81 g
21. How many sugar molecules are in a “spoonful of sugar,” if the sugar is glucose, C6H12O6, and the spoon
hold 5.00 g of sugar? 7.91 x 1021 mol.
22. Sulfur is a non-metal. Its presence in coal causes acid rain when coal is burned as a fuel. When sulfur
burns in oxygen, it forms sulfur trioxide. The sulfur trioxide then reacts with water in the atmosphere to
form sulfuric acid. A sample of coal contains 18.7 g of sulfur. Calculate how many molecules of
sulfuric acid are created when the coal burns. 3.51 x 1023 mol.
23. Calculate the number of oxygen atoms in 15.0 g of calcium nitrate. 3.30 x 1023 atoms
24. State two other equivalent descriptions of the following amount of substance: 12.04 x1023 molecules of
phosphorus pentachloride. nPCl5 = 2 mol; mPCL5 = 416.44 g
25. Vitamin C (ascorbic acid), C6H8O6, is not stored by the human body because it is a water-soluble
vitamin. During the winter months, many people take vitamin C tablets to supplement their diet and try
to prevent a cold. Determine the number of molecules of vitamin C in a 500 mg tablet. 1.71 x 1021 mol.
26. Consider one mole of calcium nitrate.
(a) How many moles of oxygen atoms does it contain? 6 mol
(b) How many moles of atoms does it contain in total? 9 mol
(c) How many atoms does it contain in total? 5.40 x 1024 atoms
27. Consider one mole of carbonic acid, H2CO3.
(a) How many moles of oxygen atoms does it contain? 3 mol
(b) How many moles of atoms does it contain in total? 6 mol
(c) How many atoms does it contain in total? 3.61 x 1024 atoms
28. Consider 62.03g of carbonic acid, H2CO3.
(a) How many moles of oxygen atoms does it contain? 3 mol
(b) How many atoms does it contain in total? 3.61 x 1024 atoms
(c) How many moles of atoms does it contain in total? 6 mol
29. If you have 2.45 x 1024 molecules of copper(I) phosphate:
(a) You have how many moles of the molecule? 4.07 mol
(b) You have how many moles of copper atoms? 12.21 mol
(c) You have how many moles of oxygen atoms? 16.28 mol
30. Consider 5.6 moles of carbonic acid, H2CO3.
(a) What mass of oxygen diatomic molecules does it take to make 5.6 moles of the acid? 268.80 g
(b) How many moles of atoms does 5.6 moles of the acid contain in total? 33.60 mol
(c) How many moles of acid molecules does it contain in total? 5.6 mol
31. Consider one mole of sulphuric acid, H2SO4.
(a) How many moles of oxygen molecules does it contain? 2 mol
(b) How many moles of atoms does it contain in total? 7 mol
(c) How many atoms does it contain in total? 4.21 x 1024 atoms
32. Consider 3.22 moles of nitric acid, HNO3.
(a) How many moles of oxygen atoms does it contain? 9.66 mol
(b) How many moles of atoms does it contain in total? 16.10 mol
(c) How many atoms does it contain in total? 9.69 x 1024 atoms