This document is a chemistry worksheet about mole calculations and percent composition. It contains 23 practice problems calculating things like the number of moles, atoms, or formula units present given a mass or vice versa. It also contains 7 problems calculating the percent composition of compounds from balanced chemical equations or given compound formulas. The answers to the problems are provided on the last page.
This document is a chemistry worksheet about mole calculations and percent composition. It contains 23 practice problems calculating things like the number of moles, atoms, or formula units present given a mass or vice versa. It also contains 7 problems calculating the percent composition of compounds from balanced chemical equations or given compound formulas. The answers to the problems are provided on the last page.
This document is a chemistry worksheet about mole calculations and percent composition. It contains 23 practice problems calculating things like the number of moles, atoms, or formula units present given a mass or vice versa. It also contains 7 problems calculating the percent composition of compounds from balanced chemical equations or given compound formulas. The answers to the problems are provided on the last page.
This document is a chemistry worksheet about mole calculations and percent composition. It contains 23 practice problems calculating things like the number of moles, atoms, or formula units present given a mass or vice versa. It also contains 7 problems calculating the percent composition of compounds from balanced chemical equations or given compound formulas. The answers to the problems are provided on the last page.
A. Mole Calculations. You will need a periodic table to look up molecular weights. Do each type of calculation until you feel that you could do it without looking at notes. If you are very comfortable with a problem, skip down to harder ones. The answers will be on the web.
1. ________________How many moles of Na are in 42 g of Na?
2. ________________How many moles of O are in 8.25 g of O?
3. ________________How much does 2.18 mol of Cu weigh?
4. ________________What is the mass of 0.28 mol of iron?
5. ________________How many atoms are in 7.2 mol of chlorine?
6. ________________How many atoms are in 36 g of bromine?
7. ________________How many moles are in 1.0 x 109 atoms?
8. ________________What is the mass of 1.20 x 1025 atoms of sulfur?
9. ________________How many moles of CO molecules are in 52 g of CO?
10. ________________How many moles of C2H6 are in 124 g?
11. ________________How many moles of CCl4 are there in 56 g?
12. ________________How much does 2.50 mol of H2SO4 weigh?
13. ________________How much does 0.25 mol of Fe2O3 weigh?
14. ________________How many molecules are there in 52 g of CO?
15. ________________How many formula units are in 22.4 g SnO2?
16. ________________How many molecules are in 116 g CCl4?
17. ________________What is the mass of 3.01 x 1023 formula units of Fe2O3?
18. ________________What is the mass of 1.2 x 1025 molecules of CO?
19. ________________How many O atoms are in 1.25 mol of SO2?
20. ________________How many moles of O atoms do you have when you have 1.20 x 1025 N2O5 molecules?
21. ________________How many formula units are in 5.33 mol of CuCl2?
22. ________________How many copper atoms are in 5.33 mol of CuCl2?
23. ________________How many moles of Cl atoms are in 5.33 mol of CuCl2?
Worksheet: Mole Calculations 1 11/19/14
Calculate the percent composition of the compounds that are formed from these reactions: 1. 9.03 g of Magnesium combine completely with 3.48 g of Nitrogen.
2. 29.0 g of Argon combine completely with 4.30 g of Sulfur.
3. 222.6 g of Sodium combine completely with 77.4 g of Oxygen.
Calculate the percent composition of each of the following compounds:
4. C2H6
5. NaHSO4
6. Ca(C2H3O2)2
7. HCN
8. H2O
Calculate the mass of the element in the given mass of compound:
9. Mass of Hydrogen in 350 g C2H6
10. Mass of Oxygen in 20.2 g of NaHSO4
11. Mass of Hydrogen in 124 g of Ca(C2H3O2)2
12. Mass of Nitrogen in 378 g HCN
Worksheet: Mole Calculations 2 11/19/14
Answers 1. 1.8 mol Na 2. 0.516 mol O 3. 139 g Cu 4. 16 g Fe 5. 4.3 x 1024 Cl atoms 6. 2.7 x 1023 Br atoms 7. 1.7 x 10-15 mol 8. 639 g S 9. 1.9 mol 10. 4.12 mol 11. 0.36 mol 12. 245 g 13. 39.9 g 14. 1.1 x 1024 molecules 15. 8.95 x 1022 formula units 16. 4.54 x 1023 molecules 17. 79.9 g Fe2O3 18. 5.6 x 102 g CO 19. 1.51 x 1024 O atoms 20. 99.7 mol O 21. 3.21 x 1024 formula units 22. 3.21 x 1024 Cu atoms 23. 10.7 mol of Cl atoms 24. 0.10 mol CuCl2 25. 3.79 x 1024 O atoms 26. 6.79 x 1023 H atoms