Question

calculate the mass of the following
1. 10 moles of sodium sulphite (Na2SO3)
2. 4 moles of aluminium atom [At. Mass of Na=23u, S=32u, O=16u, Al=27u]

Answer 1

given,

1)Gram Molecular Mass = 10 (2*23+32+3*16) = 10(126) = 1260g

2)Gram Molecular Mass = 4(27) = 108g

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Answer 2

Hi there !!

No: of moles = Given mass / Molar mass

No: of moles = 10

Molar mass of Na₂SO₃ = 2×23 + 32 + 3 × 16 = 126 u

Mass = No: of moles × Molar mass
          = 10 × 126 
         = 1260 grams

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NO: of moles = 4

Molar mass = 27 u

Mass = No: of moles × Molar mass
          = 27 × 4
          = 108 grams