Molar Mass of C8H4O3 (Phthalic Anhydride)

Molar Mass Calculator

What is the molar mass of C₈H₄O₃?

Answer

M(C₈H₄O₃) =

148.117 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	8	12.011	96.088 w ≈ 64.87%	≈ 64.87%
Hhydrogen	4	1.0080	4.0320 w ≈ 2.72%	≈ 2.72%
Ooxygen	3	15.999	47.997 w ≈ 32.40%	≈ 32.40%
Σ = 148.117 g/mol w = 100%				100%

Each fraction is rounded on its own, so the printed ones add up to 99.99%; unrounded, they make exactly 100%.

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

Mass fractions of the elements

C 64.87%

O 32.40%H 2.72%

Related Calculations

See Also

Liters to Kilograms - How many kilograms are in a liter of water, honey, gasoline, sand and other substances — by density
Grams to Kg - Convert Grams to Kilograms
Percentage Calculator: Fraction to Percent - What percentage one number is of another? Convert fraction into a percentage
Scientific Calculator with Memory & History - Free Engineering Calculator Online with Memory Function, Operation History, Logarithms & Trigonometry. Similar to ti-83, ti-84, ti-89

Recalculate with different values ↑

Molar masses of substances nearby

Formula	M, g/mol
Cd(OH)₂ (cadmium hydroxide)	146.42
C₅H₉NO₄ (DL-glutamic acid)	147.130
SrCO₃ (strontium carbonate)	147.63
C₈H₄O₃ (phthalic anhydride)	148.117
C₉H₈O₂ ((E)-cinnamic acid)	148.161
Mg(NO₃)₂ (magnesium nitrate)	148.313
C₅H₁₁NO₂S (DL-methionine)	149.21

FAQ

What is the molar mass of C8H4O3?

M(C₈H₄O₃) = 148.117 g/mol

How to calculate the molar mass of C₈H₄O₃?

Add up the atomic weights of all the atoms in the formula: 8 × 12.011 + 4 × 1.0080 + 3 × 15.999 = 148.117 g/mol.

How many grams are in 2 moles of C₈H₄O₃?

m = n × M = 2 mol × 148.117 g/mol = 296.234 g.

See Also