The number of formula units of Na₂SO₄ present in the sample is 3.01×10²³ units
Avogadro's hypothesis
From Avogadro's hypothesis,
1 mole of Na₂SO₄ = 6.02×10²³ units
But
1 mole of Na₂SO₄ = (23×2) + 32 + (16×4) = 142 g
Thus,
142 g of Na₂SO₄ = 6.02×10²³ units
How to determine the units in 71 g of sample
142 g of Na₂SO₄ = 6.02×10²³ units
Therefore,
71 g of Na₂SO₄ = (71 × 6.02×10²³) / 142
71 g of Na₂SO₄ = 3.01×10²³ units
Thus, 3.01×10²³ units of Na₂SO₄ is present in the sample
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