#### Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of Fe3O4 is 231.5326 g/mol
Compound name is iron(ii,iii) oxide

Convert between Fe3O4 weight and moles
 Compound Moles Weight, g Fe3O4

Elemental composition of Fe3O4
ElementSymbolAtomic weightAtomsMass percent
IronFe55.845372.3591
OxygenO15.9994427.6409

 Mass percent composition Atomic percent composition

Sample reactions for Fe3O4
 Equation Reaction type Fe3O4 + H2 = Fe + H2O single replacement Al + Fe3O4 = Al2O3 + Fe single replacement Fe3O4 + CO = Fe + CO2 double replacement Fe3O4 + CO = FeO + CO2 double replacement Fe3O4 + O2 = Fe2O3 synthesis

Formula in Hill system is Fe3O4

### Computing molar mass (molar weight)

To calculate molar mass of a chemical compound enter its formula and click 'Compute'. In chemical formula you may use:
• Any chemical element. Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al.
• Functional groups: D, Ph, Me, Et, Bu, AcAc, For, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg
• parantesis () or brackets [].
• Common compound names.
Examples of molar mass computations: NaCl, Ca(OH)2, K4[Fe(CN)6], CuSO4*5H2O, water, nitric acid, potassium permanganate, ethanol, fructose.

Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa.

### Computing molecular weight (molecular mass)

To calculate molecular weight of a chemical compound enter it's formula, specify its isotope mass number after each element in square brackets.
Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2.

### Definitions of molecular mass, molecular weight, molar mass and molar weight

• Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)
• Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol.
Weights of atoms and isotopes are from NIST article.