Lanthanum Oxide La2O3, Properties Molecular formula La2O3 Molar mass 325.81 g/mol Appearance White powder, hygroscopic Density 6.51 g/cm3, solid Melting point 2315 'C (2588 K) Boiling point 4200 'C (4500 K) Solubility in water Insoluble CAS No.: 1312-81-8 EINECS No.:215-200-5 spec typical TREO: 97% min. 98.5% La2O3/TREO: 99.9% min. 99.95% CeO2/ TREO: 0.025% max. 0.01% Pr6O11/TREO: 0.025% max. 0.01% Nd2O3/TREO: 0.015% max. 0.01% Sm2O3/TREO: 0.02% max. 0.003% Y2O3/TREO: 0.01% max. 0.001% Fe2O3: 0.02% max. 0.008% CaO: 0.20% max. 0.07% Cl: 0.10% max. 0.06% SiO2: 0.03% max. 0.03% L.O.I.: 3% max. 1.2% Scandium(III) oxide Yttrium(III) oxide Actinium(III) oxide Related compounds Lanthanum aluminium oxide, LaSrCoO4