Podane substancje podziel na grupy o jednakowych masach molowych: CO; H2So4; CuO; H3PO4; C12H22O11; SO3; N2; AL2(SO4)3

m(CO) = 12g + 16g = 28g/mol m(H₂SO₄) = 2g + 32g + 4·16g = 34g + 64g = 98g/mol m(CuO) = 64g + 16g = 80g/mol m(H₃PO₄) = 3g + 31g + 4·16g = 34g + 64g = 98g/mol m(C₁₂H₂₂O₁₁) = 12·12g + 22·1g + 11·16g = 144g + 22g + 176g = 342g/mol m(SO₃) =32g + 3·16g = 32g + 48g = 80g/mol m(N₂) = 2·14g = 28g/mol m(Al₂(SO₄)₃) = 2·27g + 3·32g + 12·16g = 54g + 96g + 192g = 342g/mol   Masa molowa 28g/mol: CO, N₂ Masa molowa 80g/mol: CuO, SO₃ Masa molowa 98g/mol: H₂SO₄, H₃PO₄ Masa molowa 342g/mol: C₁₂H₂₂O₁₁, Al₂(SO₄)₃