| 1. | Give the name of the following compounds: (a) Li2SO4, (b) CaCl2, (c) Na2HPO4.2H2O, (d) KHSO4, (e) PbF2, (f) NH4Br, (g) MnSO4.H2O |
| Answer: (a) Lithium sulfate, (b) Calcium chloride, (c) Sodium hydrogen phosphate dihydrate, (d) Potassium hydrogen sulfate (e) Plumbous fluoride or Lead(II) fluoride (f) Ammonium bromide (g) Manganese sulfate monohydrate |
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| 2. | Give the formula of the following compounds: (a) Magnesium chloride, (b) Barium peroxodisulfate tetrahydrate, (c) Lithium hydroxide monohydrate, (d) Ammonium bromide, (e) Nickel chloride, (f) Lithium bromide, (g) Aluminum nitrate nonahydrate |
| Answer: (a) MgCl2, (b) BaS2O8.4H2O, (c) LiOH.H2O, (d) NH4Br (e) NiCl2 (f) LiBr (g) Al(NO3)3.9H2O |
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| 3. | What is the formula weights of the following compounds: (a) CaC4H4O6.2H2O, (b) Na2S.9H2O, (c) NH4NO3, (d) Sr(NO3)2, (e) NH4SCN, (f) KCl, (g) CuS |
| Answer: (a) 224.1824 g , (b) 240.17634 g, (c) 80.0432 g, (d) 211.6298 g, (e) 76.116 g, (f) 74.5513 g, (g) 95.606 g |
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| 4. | Calculate the number of moles of LiNO3 that will contain 6.02 x 1023 atoms of O. |
| Answer: 0.33 mol LiNO3 |
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| 5. | Calculate the number of moles of UO2(NO3)2 that will contain 6.02 x 1023 atoms of O. |
| Answer: 0.125 mol UO2(NO3)2 |
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| 6. | Calculate the number of moles of AlK(SO4)2.12H2O that will contain 6.02 x 1023 atoms of O. |
| Answer: 0.05 mol AlK(SO4)2.12H2O |
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| 7. | How many number of Co atoms are contained in 43.3 g of CoSO4? |
| Answer: 1.68 x 1023 Co atoms |
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| 8. | How many number of F atoms are contained in 7.81 g of BaF2? |
| Answer: 5.36 x 1022 F atoms |
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| 9. | How many number of Cr atoms are contained in 63.75 g of Hg2CrO4? |
| Answer: 7.42 x 1022 Cr atoms |
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| 10. | How many number of I atoms are contained in 2.54 g of Hg2I2? |
| Answer: 4.67 x 1021 I atoms |
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| 11. | Determine the number of molecules of (NH4)2S present in 59.86 g of (NH4)2S. |
| Answer: 5.29 x 1023 molecules |
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| 12. | Determine the number of molecules of Rb2SO4 present in 83.38 g of Rb2SO4. |
| Answer: 1.88 x 1023 molecules |
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| 13. | Determine the number of molecules of NH4Br present in 12.3 g of NH4Br. |
| Answer: 7.56 x 1022 molecules |
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| 14. | Calculate the weight in grams of 2.62 mol Cd(NO3)2.4H2O. |
| Answer: 808.22 g |
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| 15. | Calculate the weight in grams of 0.92 mol NH4NO3. |
| Answer: 73.64 g |
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| 16. | Calculate the weight in grams of 3.8 mol NaCH3COO. |
| Answer: 311.73 g |
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| 17. | Determine the mass of 8.04 x 10-9 mol of CaCl2. Calculate the number of Ca atoms in 8.04 x 10-9 mol of CaCl2. |
| Answer: 8.92 x 10-7 g; 4.84 x 1015 atoms |
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| 18. | Determine the mass of 10 x 10-3 mol of MgSO4.7H2O. Calculate the number of O atoms in 10 x 10-3 mol of MgSO4.7H2O. |
| Answer: 2.46 g; 6.62 x 1022 atoms |
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| 19. | Determine the mass of 9.27 x 10-8 mol of KNO3. Calculate the number of O atoms in 9.27 x 10-8 mol of KNO3. |
| Answer: 9.37 x 10-6 g; 1.67 x 1017 atoms |
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| 20. | How many grams of each of the constituent elements are contained in 1 mol of: (a) LiI, (b) Li2SO4.H2O, (c) Rb2SO4, (d) CaC4H4O6.2H2O, (e) CsCl, (f) CoSO4, (g) Ba(NO3)2.H2O |
| Answer: (a) 1 mol Li = 6.941 g Li, 1 mol I = 126.9045 g I; (b) 2 mol H = 2.0158 g H, 5 mol O = 79.997 g O, 2 mol Li = 13.882 g Li, 1 mol S = 32.06 g S; (c) 2 mol Rb = 170.9356 g Rb, 1 mol S = 32.06 g S, 4 mol O = 63.9976 g O; (d) 8 mol H = 8.0632 g H, 8 mol O = 127.9952 g O, 1 mol Ca = 40.08 g Ca, 4 mol C = 48.044 g C; (e) 1 mol Cs = 132.9054 g Cs, 1 mol Cl = 35.453 g Cl; (f) 1 mol Co = 58.9332 g Co, 1 mol S = 32.06 g S, 4 mol O = 63.9976 g O; (g) 2 mol H = 2.0158 g H, 7 mol O = 111.9958 g O, 1 mol Ba = 137.33 g Ba, 2 mol N = 28.0134 g N |
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| 21. | Calculate the number of moles in 8.25 g CuCl2. |
| Answer: 0.06 mol CuCl2 |
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| 22. | Calculate the number of moles in 46.24 g NaH2PO4. |
| Answer: 0.39 mol NaH2PO4 |
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| 23. | Calculate the number of moles in 48.82 g Sr(NO3)2. |
| Answer: 0.23 mol Sr(NO3)2 |
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| 24. | Determine the number of moles in 3.49 g of Be. |
| Answer: 0.39 mol Be |
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| 25. | Determine the number of moles in 68.94 g of O. |
| Answer: 4.31 mol O |
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| 26. | Determine the number of moles in 98.05 g of Si. |
| Answer: 3.49 mol Si |
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| 27. | Calculate the weight of one molecule of (a) Hg2CrO4, (b) FeSO4.7H2O, (c) ZnSO4.H2O, (d) Cu(OH)2, (e) MgCl2.6H2O, (f) Cu(NO3)2, (g) Al(OH)3 |
| Answer: (a) 8.59 x 10-22 g/molecule, (b) 4.62 x 10-22 g/molecule, (c) 2.98 x 10-22 g/molecule, (d) 1.62 x 10-22 g/molecule, (e) 3.38 x 10-22 g/molecule, (f) 3.12 x 10-22 g/molecule, (g) 1.3 x 10-22 g/molecule |
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| 28. | How much BaCO3 can be produced from 62.98 g of O? |
| Answer: 258.94 g BaCO3 |
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| 29. | How much MnS can be produced from 68.56 g of Mn? |
| Answer: 108.57 g MnS |
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| 30. | How much Al(OH)3 can be produced from 62.1 g of Al? |
| Answer: 179.53 g Al(OH)3 |
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