1. Zoek de molaire massa van elk element

* NA (natrium): 22,99 g/mol

* s (zwavel): 32.06 g/mol

* o (zuurstof): 16.00 g/mol

2. Bereken de molaire massa van Na₂so₄

* 2 na atomen * 22,99 g/mol =45,98 g/mol

* 1 s atoom * 32.06 g/mol =32,06 g/mol

* 4 O atomen * 16.00 g/mol =64,00 g/mol

* Totale molaire massa:45,98 + 32.06 + 64,00 = 142.04 g/mol

3. Bereken het percentage samenstelling van elk element

* na: (45,98 g/mol/142.04 g/mol) * 100% = 32,37%

* s: (32.06 g/mol/142.04 g/mol) * 100% = 22,57%

* o: (64,00 g/mol/142.04 g/mol) * 100% = 45,06%

Daarom is het percentage samenstelling van Na₂so₄:

* na: 32,37%

* s: 22,57%

* o: 45,06%