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Question:
Q.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)?
Answer:
(a)- The molar mass of nitrogen is 14g. So, 1mole of nitrogen atoms weigh 14g.
Therefore, the mass of 1 mole of nitrogen atom is 14 g.
(b)- The molar mass of aluminium atom is 27g. This means that the mass of 1 mole of aluminium atom will be 27g.
Therefore, the mass of 4 moles of aluminum atom is 108 g.
(c)- The sodium sulphite (Na2SO3)contains sodium, sulphur, and oxygen atoms. The gram atomic mass of sodium is 23g, sulphur is 32g, and oxygen is 16g.
So, the Molar mass of Na2SO3 = 2(Atomic mass of Na) + Atomic mass of s + 3(Atomic mass of O)
= 2(23g) +32g + 3(16g) = 126g
This means that the mass of one mole of Na2SO3 is 126g.
Therefore, the mass of 10 moles of sodium sulphite is 1260g
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