Molecular weights of some oxides and factors to convert them to elements by weight.

Oxide Mol. Wt. Factor Al2O3 101.96128 0.529251 As2O3 197.89 0.7574 Au2O 409.93 0.9610 B2O3 69.6182 0.310551 BaO 153.3394 0.895660 BeO 25.01158 0.360320 CO2 44.0098 0.272916 CaO 56.0794 0.714701 CeO2 172.1188 0.814089 Ce2O3 328.2382 0.853770 CoO 74.9326 0.786483 Cr2O3 151.9902 0.684202 Cs2O 281.8102 0.943226 CuO 79.5454 0.798865 Dy2O3 372.9982 0.871318 Er2O3 382.5182 0.874520 EuO 167.9594 0.904742 Eu2O3 351.9182 0.863610 FeO 71.8464 0.777311 Fe2O3 159.6922 0.699433 Ga2O3 187.4382 0.743925 Gd2O3 362.4982 0.867591 GeO2 104.5858 0.694051 H2O 18.0152 0.111694 HfO2 210.4888 0.847979 Ho2O3 377.8588 0.872973 K2O 94.1954 0.830147 La2O3 325.8092 0.852680 Li2O 29.8814 0.464570 Lu2O3 397.9382 0.879383 MgO 40.3044 0.603036 MnO 70.9374 0.774457

Oxide Mol. Wt. Factor MnO2 86.9368 0.631930 Mn3O4 228.8116 0.720304 MoO3 143.94 0.6665 Na2O 61.97894 0.741857 Nb2O5 265.8098 0.699044 Nd2O3 336.4782 0.857351 NiO 74.7094 0.785845 P2O5 141.94452 0.436421 PbO 223.1994 0.928318 Pr2O3 329.8136 0.854469 Rb2O 186.9350 0.914412 SO3 80.0582 0.400459 Sb2O3 291.4982 0.835340 Sc2O3 137.9100 0.651960 SiO2 60.0848 0.467439 Sm2O3 348.7982 0.862390 SnO2 150.6888 0.787650 SrO 103.6194 0.845595 Ta2O5 441.8928 0.818967 Tb2O3 365.8490 0.868803 ThO2 264.0369 0.878809 TiO2 79.8988 0.599508 Ti2O3 143.7982 0.666211 Tm2O3 385.8666 0.875609 UO2 270.0278 0.881498 U3O8 842.0822 0.848002 V2O5 181.8798 0.560166 WO3 231.85 0.7930 Y2O3 255.8100 0.787440 Yb2O3 394.0782 0.878201 ZnO 81.3794 0.803397 ZrO2 123.2188 0.740309