1. How many moles of calcium chloride are there in a sample containing x particles? l

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Maurice Crawford
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1 1. How many moles of calcium chloride are there in a sample containing x particles? l 2. A sample of water contains 3.01x10 23 water molecules a. How many moles of water molecules are present in this sample? b. How many moles of oxygen atoms are present in this sample of water? (assuming no gases are dissolved in the water) 3. A sample of sulphuric acid H 2 SO 4 contains 4.904g. a. How many moles of sulphuric acid are in the sample b. What is the mass of the oxygen particles in the sample of sulphuric acid?

2 mol 2 a. 0.5 mol b. 0.5 mol 3. a mol b g

3 4. How many moles are there in 72 g of Mg? 5. How many moles are there in 4 kg of CuO? 6. How many moles are there in 39 g of Al(OH) 3? 7. How many moles are there in 20 mg of Cu(NO 3 ) 2?

4 4. 72 g of Mg 3.0 mol 5. 4 kg of CuO 50.3 mol g of Al(OH) mol mg of Cu(NO 3 ) x 10-4 mol

5 8. What is the mass of 5 moles of Cl 2 9. What is the mass of 0.2 moles of Al 2 O What is the mass of 0.01 moles of Ag 11. What is the mass of moles of (NH 4 ) 2 SO 4

6 8. 5 moles of Cl g moles of Al 2 O g moles of Ag 1.07 g moles of (NH 4 ) 2 SO g

7 12. An experiment was carried out to find the molecular mass of vitamin C (ascorbic acid). It was found that 1.00 g contains moles of Vitamin C molecules. Calculate the molecular mass of vitamin C. 13. A. Calculate the mass of moles of hydrogen atoms B. How many hydrogen atoms are in moles of hydrogen atoms 14. A. Calculate the amount of moles in g of iron: B. How many atoms of iron are in g iron?

8 12. 5) An experiment was carried out to find the M r of vitamin C (ascorbic acid). It was found that 1.00 g contains moles of Vitamin C molecules. Calculate the M r of vitamin C. (176 g/mol) 13. A. Calculate the mass of moles of hydrogen atoms (0.1 g) B. How many hydrogen atoms are in moles of hydrogen atoms (6.02 x ) 14. A. Calculate the amount of moles in g of iron: (2.68x10-3 mol) B. How many atoms of iron are in g iron? (3.23 x )

9 15. Find the molecular mass of the following compound: moles of X has a mass of g 16. How many moles of H 2 SO 4 are there in 98.1 g of H 2 SO 4? 17. What mass of O 2 is required to ignite 20.0 g of hydrogen in oxygen? H 2 + O 2 H 2 O

10 15. Find the M r of the following compound: moles of X has a mass of g (127 g/mol) 16. How many moles of H 2 SO 4 are there in 98.1 g of H 2 SO 4? (1 mol) 17. What mass of O 2 is required to ignite 20.0 g of hydrogen in oxygen? (160 g) 2 H 2 + O 2 2 H 2 O n H2 = 20/2 = 10 mol 10 mol :5 mol mass of O 2 = 5 32 = 160g

11 18. The pollutant sulphur dioxide can be removed from the air by the following reaction. What mass of sulphur dioxide will 10.0 kg of calcium carbonate remove? CaCO 3 + SO 2 + O 2 CaSO 4 + CO What mass of Na 2 O is produced when 2.50 g of sodium is burned in oxygen? Na + O 2 Na 2 O 20. What mass of magnesium oxide is formed when 6.00 g of magnesium reacts with oxygen? Mg + O 2 MgO

12 18. The pollutant sulphur dioxide can be removed from the air by the following reaction. What mass of sulphur dioxide will 10.0 kg of calcium carbonate remove? (6.4 kg) 2 CaCO SO 2 + O 2 2 CaSO CO 2 n CaCO3 = 10.0/100 = 0.1 mol 0.1mol 0.1 mol mass SO2 = 0.1 x 64 = 6.4kg 19. What mass of Na 2 O is produced when 2.50 g of sodium is burned in oxygen? (3.37g) 4 Na + O 2 2 Na 2 O n Na = 2.5/23 = mol mol mol mass Na2O = x 62 = 3.37 g 20. What mass of magnesium oxide is formed when 6.00 g of magnesium reacts with oxygen? (10 g) 2 Mg + O 2 2 MgO

13 21. What mass of oxygen is required to oxidise 10.0 g of ammonia to NO? NH 3 + O 2 NO + H 2 O 22. Aspirin is made by the reaction shown below. What mass of salicylic acid are needed to make one aspirin tablet that contains 500 mg of aspirin? (0.384 g) C 7 H 6 O 3 + C 4 H 6 O 3 C 9 H 8 O 4 + C 2 H 4 O 2 salicylic acid + ethanoic anhydride aspirin + ethanoic acid 23. TNT, C 7 H 5 N 3 O 6, is a common explosive made from the reaction of methyl benzene, C 7 H 8, with nitric acid. C 7 H 8 + HNO 3 C 7 H 5 N 3 O 6 + H 2 O a) What mass of methyl benzene is needed to make 10.0 kg of TNT? b) What mass of nitric acid is needed to make 10.0 kg of TNT?

14 21. What mass of oxygen is required to oxidise 10.0 g of ammonia to NO? (23.5 g) 4 NH O 2 4 NO + 6 H 2 O 22. Aspirin is made by the reaction shown below. What mass of salicylic acid are needed to make one aspirin tablet that contains 500 mg (0.5 g) of aspirin? (0.384 g) C 7 H 6 O 3 + C 4 H 6 O 3 C 9 H 8 O 4 + C 2 H 4 O 2 salicylic acid + ethanoic anhydride aspirin + ethanoic acid 23. TNT, C 7 H 5 N 3 O 6, is a common explosive made from the reaction of methyl benzene, C 7 H 8, with nitric acid. C 7 H HNO 3 C 7 H 5 N 3 O H 2 O a) What mass of methyl benzene is needed to make 10.0 kg of TNT? (4.05 kg) b) What mass of nitric acid is needed to make 10.0 kg of TNT? (8.33 kg)

15 24. Sulfur dioxide reacts with oxygen to make sulfur trioxide. SO 2 + O 2 SO 3 a) Calculate the maximum theoretical mass of sulfur trioxide that can be made by reacting 96 g of sulfur dioxide with an excess of oxygen. b) In the reaction, only 90 g of sulfur trioxide was made. Calculate the percentage yield 25. Iron is extracted from iron oxide in the Blast Furnace as shown. Fe 2 O 3 + CO Fe + CO 2 a) Calculate the maximum theoretical mass of iron that can be made from 1 kg of iron oxide.

16 24. Sulfur dioxide reacts with oxygen to make sulfur trioxide. 2 SO 2 + O 2 2 SO 3 a) Calculate the maximum theoretical mass of sulfur trioxide that can be made by reacting 96 g of sulfur dioxide with an excess of oxygen. SO 2 = 32 + (16 x 2) = 64 (120g) n SO 2 = mass = 96 = 1.5 mol MOLE RATIO 1SO 2 : 1SO 3 mol SO 3 = 1.5 mol Mr 64 mass SO 3 = n x Mr 1.5 x g b) In the reaction, only 90 g of sulfur trioxide was made. Calculate the percentage yield (75%) % yield 90/120 x 100 = 75% 25. Iron is extracted from iron oxide in the Blast Furnace as shown. Fe 2 O CO 2 Fe + 3 CO 2 a) Calculate the maximum theoretical mass of iron that can be made from 1 kg of iron oxide. (700 g)

Topic Reacting masses Level GCSE Outcomes 1. To calculate reacting masses 2. To set out mole calculations in a grid format

Topic Reacting masses Level GCSE Outcomes 1. To calculate reacting masses 2. To set out mole calculations in a grid format Problems on Reacting Masses of Solids Section 1 1. What is the mass of magnesium