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

Molar mass of H3PO4 is 97.9952 g/mol
Compound name is phosphoric acid

Convert between H3PO4 weight and moles
CompoundMolesWeight, g
H3PO4

Elemental composition of H3PO4
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079433.0857
PhosphorusP30.973762131.6074
OxygenO15.9994465.3069

Mass percent compositionAtomic percent composition

Sample reactions for H3PO4
EquationReaction type
Ca(OH)2 + H3PO4 = Ca3(PO4)2 + H2Odouble replacement
KOH + H3PO4 = K3PO4 + H2Odouble replacement
H3PO4 + Mg(OH)2 = Mg3(PO4)2 + H2Odouble replacement
NaOH + H3PO4 = Na3PO4 + H2Odouble replacement
H3PO4 = H4P2O7 + H2Odecomposition

Formula in Hill system is H3O4P

### 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.

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