Molar Mass of C6H7N3O (Isoniazid)

Molar Mass Calculator

What is the molar mass of C₆H₇N₃O?

Answer

M(C₆H₇N₃O) =

137.142 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024).

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Ccarbon	6	12.011	72.066 w ≈ 52.55%	≈ 52.55%
Hhydrogen	7	1.0080	7.0560 w ≈ 5.15%	≈ 5.15%
Nnitrogen	3	14.007	42.021 w ≈ 30.64%	≈ 30.64%
Ooxygen	1	15.999	15.999 w ≈ 11.67%	≈ 11.67%
Σ = 137.142 g/mol w = 100%				100%

Each fraction is rounded on its own, so the printed ones add up to 100.01%; unrounded, they make exactly 100%.

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

Mass fractions of the elements

C 52.55%

N 30.64%O 11.67%H 5.15%

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Molar masses of substances nearby

Formula	M, g/mol
KH₂PO₄ (monobasic potassium phosphate)	136.084
CaSO₄ (calcium sulfate)	136.13
ZnCl₂ (zinc chloride)	136.28
C₆H₇N₃O (isoniazid)	137.142
PCl₃ (phosphorus trichloride)	137.32
Ba (barium)	137.33
C₇H₆O₃ (salicylic acid)	138.122

FAQ

What is the molar mass of C6H7N3O?

M(C₆H₇N₃O) = 137.142 g/mol

How to calculate the molar mass of C₆H₇N₃O?

Add up the atomic weights of all the atoms in the formula: 6 × 12.011 + 7 × 1.0080 + 3 × 14.007 + 15.999 = 137.142 g/mol.

How many grams are in 2 moles of C₆H₇N₃O?

m = n × M = 2 mol × 137.142 g/mol = 274.284 g.

See Also