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R 62%, 10:29 AM, (d) Potassium sulphate., 6. Calculate the molar mass of the following substances., (a) Ethyne, C2H2, (b) Sulphur molecule, S3, (c) Phosphorus molecule, P4 (Atomic mass of phosphorus = 31), %3D, (d) Hydrochloric acid, HCI, (e) Nitric acid, HNO3, 7. What is the mass of-, (a) 1 mole of nitrogen atoms?, (b) 4 moles of aluminium atoms (Atomic mass of aluminium = 27)?, (c) 10 moles of sodium sulphite (Na2SO3)?, 8. Convert into mole., (a) 12 g of oxygen gas, (b) 20 g of water, (c) 22 g of carbon dioxide., 9. What is the mass of:, (a) 0.2 mole of oxygen atoms?, (b) 0.5 mole of water molecules?, 10. Calculate the number of molecules of sulphur (Sg) present in 16 g of solid, sulphur., 11. Calculate the number of aluminium ions present in 0.051 g of aluminium, oxide., (Hint: The mass of an ion is the same as that of an atom of the same element., Atomic mass of Al = 27 u)