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

Molar mass of H3BO3 is 61.8330 g/mol
Compound name is boric acid

Convert between H3BO3 weight and moles
 Compound Moles Weight, g H3BO3

Elemental composition of H3BO3
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079434.8903
BoronB10.811117.4842
OxygenO15.9994377.6255

 Mass percent composition Atomic percent composition

Sample reactions for H3BO3
 Equation Reaction type H3BO3 = H4B6O11 + H2O decomposition H3BO3 = B2O3 + H2O decomposition H3BO3 = H2B4O7 + H2O decomposition H3BO3 + NaOH = H2O + Na2B4O7 double replacement H3BO3 + NaOH = Na3BO3 + H2O double replacement

Formula in Hill system is BH3O3

### 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.