{"id":55,"date":"2026-01-15T19:04:33","date_gmt":"2026-01-15T19:04:33","guid":{"rendered":"https:\/\/www.geol.umd.edu\/facilities\/probe\/?page_id=55"},"modified":"2026-01-15T19:04:33","modified_gmt":"2026-01-15T19:04:33","slug":"molecular-weights-of-some-oxides-and-factors-to-convert-them-to-elements-by-weight","status":"publish","type":"page","link":"https:\/\/www.geol.umd.edu\/facilities\/probe\/molecular-weights-of-some-oxides-and-factors-to-convert-them-to-elements-by-weight\/","title":{"rendered":"Molecular weights of some oxides and factors to convert them to elements by weight"},"content":{"rendered":"
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Molecular weights of some oxides and factors to convert them to elements by weight<\/h1>\n

 <\/p>\n\n\n\n
\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Oxide<\/th>\nMol. Wt.<\/th>\nFactor<\/th>\n<\/tr>\n
Al2<\/sub>O3<\/sub><\/td>\n101.96128<\/td>\n0.529251<\/td>\n<\/tr>\n
As2<\/sub>O3<\/sub><\/td>\n197.89<\/td>\n0.7574<\/td>\n<\/tr>\n
Au2<\/sub>O<\/td>\n409.93<\/td>\n0.9610<\/td>\n<\/tr>\n
B2<\/sub>O3<\/sub><\/td>\n69.6182<\/td>\n0.310551<\/td>\n<\/tr>\n
BaO<\/td>\n153.3394<\/td>\n0.895660<\/td>\n<\/tr>\n
BeO<\/td>\n25.01158<\/td>\n0.360320<\/td>\n<\/tr>\n
CO2<\/sub><\/td>\n44.0098<\/td>\n0.272916<\/td>\n<\/tr>\n
CaO<\/td>\n56.0794<\/td>\n0.714701<\/td>\n<\/tr>\n
CeO2<\/sub><\/td>\n172.1188<\/td>\n0.814089<\/td>\n<\/tr>\n
Ce2<\/sub>O3<\/sub><\/td>\n328.2382<\/td>\n0.853770<\/td>\n<\/tr>\n
CoO<\/td>\n74.9326<\/td>\n0.786483<\/td>\n<\/tr>\n
Cr2<\/sub>O3<\/sub><\/td>\n151.9902<\/td>\n0.684202<\/td>\n<\/tr>\n
Cs2<\/sub>O<\/td>\n281.8102<\/td>\n0.943226<\/td>\n<\/tr>\n
CuO<\/td>\n79.5454<\/td>\n0.798865<\/td>\n<\/tr>\n
Dy2<\/sub>O3<\/sub><\/td>\n372.9982<\/td>\n0.871318<\/td>\n<\/tr>\n
Er2<\/sub>O3<\/sub><\/td>\n382.5182<\/td>\n0.874520<\/td>\n<\/tr>\n
EuO<\/td>\n167.9594<\/td>\n0.904742<\/td>\n<\/tr>\n
Eu2<\/sub>O3<\/sub><\/td>\n351.9182<\/td>\n0.863610<\/td>\n<\/tr>\n
FeO<\/td>\n71.8464<\/td>\n0.777311<\/td>\n<\/tr>\n
Fe2<\/sub>O3<\/sub><\/td>\n159.6922<\/td>\n0.699433<\/td>\n<\/tr>\n
Ga2<\/sub>O3<\/sub><\/td>\n187.4382<\/td>\n0.743925<\/td>\n<\/tr>\n
Gd2<\/sub>O3<\/sub><\/td>\n362.4982<\/td>\n0.867591<\/td>\n<\/tr>\n
GeO2<\/sub><\/td>\n104.5858<\/td>\n0.694051<\/td>\n<\/tr>\n
H2<\/sub>O<\/td>\n18.0152<\/td>\n0.111694<\/td>\n<\/tr>\n
HfO2<\/sub><\/td>\n210.4888<\/td>\n0.847979<\/td>\n<\/tr>\n
Ho2<\/sub>O3<\/sub><\/td>\n377.8588<\/td>\n0.872973<\/td>\n<\/tr>\n
K2<\/sub>O<\/td>\n94.1954<\/td>\n0.830147<\/td>\n<\/tr>\n
La2<\/sub>O3<\/sub><\/td>\n325.8092<\/td>\n0.852680<\/td>\n<\/tr>\n
Li2<\/sub>O<\/td>\n29.8814<\/td>\n0.464570<\/td>\n<\/tr>\n
Lu2<\/sub>O3<\/sub><\/td>\n397.9382<\/td>\n0.879383<\/td>\n<\/tr>\n
MgO<\/td>\n40.3044<\/td>\n0.603036<\/td>\n<\/tr>\n
MnO<\/td>\n70.9374<\/td>\n0.774457<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/td>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Oxide<\/th>\nMol. Wt.<\/th>\nFactor<\/th>\n<\/tr>\n
MnO2<\/sub><\/td>\n86.9368<\/td>\n0.631930<\/td>\n<\/tr>\n
Mn3<\/sub>O4<\/sub><\/td>\n228.8116<\/td>\n0.720304<\/td>\n<\/tr>\n
MoO3<\/sub><\/td>\n143.94<\/td>\n0.6665<\/td>\n<\/tr>\n
Na2<\/sub>O<\/td>\n61.97894<\/td>\n0.741857<\/td>\n<\/tr>\n
Nb2<\/sub>O5<\/sub><\/td>\n265.8098<\/td>\n0.699044<\/td>\n<\/tr>\n
Nd2<\/sub>O3<\/sub><\/td>\n336.4782<\/td>\n0.857351<\/td>\n<\/tr>\n
NiO<\/td>\n74.7094<\/td>\n0.785845<\/td>\n<\/tr>\n
P2<\/sub>O5<\/sub><\/td>\n141.94452<\/td>\n0.436421<\/td>\n<\/tr>\n
PbO<\/td>\n223.1994<\/td>\n0.928318<\/td>\n<\/tr>\n
Pr2<\/sub>O3<\/sub><\/td>\n329.8136<\/td>\n0.854469<\/td>\n<\/tr>\n
Rb2<\/sub>O<\/td>\n186.9350<\/td>\n0.914412<\/td>\n<\/tr>\n
SO3<\/sub><\/td>\n80.0582<\/td>\n0.400459<\/td>\n<\/tr>\n
Sb2<\/sub>O3<\/sub><\/td>\n291.4982<\/td>\n0.835340<\/td>\n<\/tr>\n
Sc2<\/sub>O3<\/sub><\/td>\n137.9100<\/td>\n0.651960<\/td>\n<\/tr>\n
SiO2<\/sub><\/td>\n60.0848<\/td>\n0.467439<\/td>\n<\/tr>\n
Sm2<\/sub>O3<\/sub><\/td>\n348.7982<\/td>\n0.862390<\/td>\n<\/tr>\n
SnO2<\/sub><\/td>\n150.6888<\/td>\n0.787650<\/td>\n<\/tr>\n
SrO<\/td>\n103.6194<\/td>\n0.845595<\/td>\n<\/tr>\n
Ta2<\/sub>O5<\/sub><\/td>\n441.8928<\/td>\n0.818967<\/td>\n<\/tr>\n
Tb2<\/sub>O3<\/sub><\/td>\n365.8490<\/td>\n0.868803<\/td>\n<\/tr>\n
ThO2<\/sub><\/td>\n264.0369<\/td>\n0.878809<\/td>\n<\/tr>\n
TiO2<\/sub><\/td>\n79.8988<\/td>\n0.599508<\/td>\n<\/tr>\n
Ti2<\/sub>O3<\/sub><\/td>\n143.7982<\/td>\n0.666211<\/td>\n<\/tr>\n
Tm2<\/sub>O3<\/sub><\/td>\n385.8666<\/td>\n0.875609<\/td>\n<\/tr>\n
UO2<\/sub><\/td>\n270.0278<\/td>\n0.881498<\/td>\n<\/tr>\n
U3<\/sub>O8<\/sub><\/td>\n842.0822<\/td>\n0.848002<\/td>\n<\/tr>\n
V2<\/sub>O5<\/sub><\/td>\n181.8798<\/td>\n0.560166<\/td>\n<\/tr>\n
WO3<\/sub><\/td>\n231.85<\/td>\n0.7930<\/td>\n<\/tr>\n
Y2<\/sub>O3<\/sub><\/td>\n255.8100<\/td>\n0.787440<\/td>\n<\/tr>\n
Yb2<\/sub>O3<\/sub><\/td>\n394.0782<\/td>\n0.878201<\/td>\n<\/tr>\n
ZnO<\/td>\n81.3794<\/td>\n0.803397<\/td>\n<\/tr>\n
ZrO2<\/sub><\/td>\n123.2188<\/td>\n0.740309<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n<\/div>\n<\/div><\/div><\/div><\/div><\/div>","protected":false},"excerpt":{"rendered":"

Molecular weights of some oxides and factors to convert them to elements by weight   Oxide Mol. Wt. Factor Al2O3 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-55","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.geol.umd.edu\/facilities\/probe\/wp-json\/wp\/v2\/pages\/55","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.geol.umd.edu\/facilities\/probe\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.geol.umd.edu\/facilities\/probe\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.geol.umd.edu\/facilities\/probe\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.geol.umd.edu\/facilities\/probe\/wp-json\/wp\/v2\/comments?post=55"}],"version-history":[{"count":1,"href":"https:\/\/www.geol.umd.edu\/facilities\/probe\/wp-json\/wp\/v2\/pages\/55\/revisions"}],"predecessor-version":[{"id":56,"href":"https:\/\/www.geol.umd.edu\/facilities\/probe\/wp-json\/wp\/v2\/pages\/55\/revisions\/56"}],"wp:attachment":[{"href":"https:\/\/www.geol.umd.edu\/facilities\/probe\/wp-json\/wp\/v2\/media?parent=55"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}