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masa molowa MgSO₄=24g+32g+4*16g=120g/mol
120----100%
24-----x%
x=24*100/120 = 20% Mg
Sól glauberska to Na₂SO₄
masa molowa Na₂SO₄=2*23g+32g+4*16g=142g/mol
142g----100%
46g------x%
x=46*100/142 = 32,4% Na