Question

How much Sodium can be obtained from 500gm of NaSo4 ? [ Atomic mass of Na =22.9 ]

Answer 1

500 percent dodium can be obtained

Answer 2

We have,

Atomic mass of Na = 22.9 u
Molar Mass of Na₂SO₄ = 2 × 22.9 + 32 + 4 × 16 = 141.8 g mol⁻¹
Molecular Weight = 500 g

No. of moles in Na₂SO₄ = 500/141.8 = 3.5 mol

Mass of Na in 1 mol of Na₂SO₄ = 3 × 22.9 = 68.7 g
Mass of Na in 3.5 mol of Na₂SO₄ = 3.5 × 68.7 = 240.45 g

Molar mass of 3.5 mol of Na₂SO₄ = 3.5 × 141.8g = 496.3 g
Hence,

Percent of Na in Na₂SO₄ = 240.45/496.3 ×100 = 48.45 %

Thus, mass of Na in Na₂SO₄ = 48.45/100 × 500 = 242.25g


Hence there is 242.25 g Na in Na₂SO₄.