Study Guides/Chemistry/Molecular Mass of Na2SO4
Study Guide · Chemistry

Molecular Mass of Na₂SO₄ (Sodium Sulphate)

Calculating the molecular mass of Na₂SO₄ is a standard exercise in Class 9 and 10 Chemistry (Atoms and Molecules chapter).

Question (Click to Flip)

How many moles are in 284 g of Na₂SO₄?

Answer

Moles = 284 / 142 = 2 moles

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Key Facts

Na₂SO₄ (Sodium Sulphate) is also called Glauber's salt when in its hydrated form Na₂SO₄·10H₂O.

Step-by-Step Calculation

Formula: Na₂SO₄ (Sodium Sulphate)

Atomic masses used:

  • Na (Sodium) = 23 g/mol
  • S (Sulphur) = 32 g/mol
  • O (Oxygen) = 16 g/mol

Count the atoms:

  • Na: 2 atoms → 2 × 23 = 46
  • S: 1 atom → 1 × 32 = 32
  • O: 4 atoms → 4 × 16 = 64

Total = 46 + 32 + 64 = 142 g/mol

Answer

The molecular mass of Na₂SO₄ = 142 g/mol

Questions and Answers

How many moles are in 284 g of Na₂SO₄?+

Moles = 284 / 142 = **2 moles**

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