Molar Mass of H3BO3 (Orthoboric Acid)

Molar Mass Calculator

What is the molar mass of H₃BO₃?

Answer

M(H₃BO₃) ≈

61.83 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — B: 10.81.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Hhydrogen	3	1.0080	3.0240 w ≈ 4.89%	≈ 4.89%
Bboron	1	10.81	10.81 w ≈ 17.48%	≈ 17.48%
Ooxygen	3	15.999	47.997 w ≈ 77.63%	≈ 77.63%
Σ = 61.831 ≈ 61.83 g/mol w = 100%				100%

Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)

Mass fractions of the elements

O 77.63%

B 17.48%H 4.89%

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Molar masses of substances nearby

Formula	M, g/mol
C₃H₇OH (propyl alcohol)	60.096
C₂H₈N₂ (ethylenediamine)	60.100
CH₃NO₂ (nitromethane)	61.040
H₃BO₃ (orthoboric acid)	61.83
Na₂O (sodium oxide)	61.979
H₂CO₃ (carbonic acid)	62.024
C₂H₆O₂ (ethylene glycol)	62.068

FAQ

What is the molar mass of H3BO3?

M(H₃BO₃) ≈ 61.83 g/mol

How to calculate the molar mass of H₃BO₃?

Add up the atomic weights of all the atoms in the formula: 3 × 1.0080 + 10.81 + 3 × 15.999 = 61.831 ≈ 61.83 g/mol.

How many grams are in 2 moles of H₃BO₃?

m = n × M = 2 mol × 61.83 g/mol = 123.66 g.

See Also