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Chapter 3 Atoms And Molecules Solutions

Question - 21 : - 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 (Na2S03)?

Answer - 21 : -

Question - 22 : - Convert into mole.
(a) 12 g of oxygen gas
(b) 20 g of water
(c) 22 g of carbon dioxide

Answer - 22 : -


Question - 23 : - What is the mass of
(a) 0.2 mole of oxygen atoms?
(b) 0.5 mole of water molecules?

Answer - 23 : - (a) Mass of 1 mole of oxygen atom = 16 u Mass of 0.2mole of oxygen atoms = (16 × 0.2) u = 3.2 u
(b) Mass of 1 mole of H20molecule =

Question - 24 : - Calculate the number of molecules of sulphur (S8) present in 16 g of solidsulphur?

Answer - 24 : - Mass of 1 mole of S8 = 8 × 32 = 256

Question - 25 : - Calculate the number of aluminium ions present in0.051 g of aluminium oxide. (Hint: The mass of an ion is the same as that of anatom of the same element. Atomic mass of Al = 27 u)

Answer - 25 : - Molar mass of Al2O3 =2 × 27 + 3 × 16

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