Molar mass of glycerol (C₃H₈O₃)

The molar mass of glycerol (C₃H₈O₃) is 92.094 g/mol, summed from the IUPAC standard atomic weights of C x 3, H x 8, O x 3.

Mass of sample

Amount of substance

mol

Molar mass

92.094g/mol

= Exact Molar mass of glycerol

Moles in the sample mass: 0.108 584 71 mol
Mass of that amount of substance: 92.094
Molecules in the sample mass: 6.53912e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 12.011*3 + 1.008*8 + 15.999*3 = 92.094
Moles in the sample mass = 10 / 92.094 = 0.108 585
Mass of that amount of substance = 1 * 92.094 = 92.094
Molecules in the sample mass = 0.108 585 * NA = 6.53912e+22

Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.

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The formula

Molar mass = sum over elements of (atomic weight x number of atoms)
For C₃H₈O₃: 12.011 x 3 + 1.008 x 8 + 15.999 x 3 = 92.094 g/mol
Moles = mass / molar mass; mass = moles x molar mass
Molecules = moles x 6.02214076 x 10^23 (the Avogadro constant, exact by definition)

Molar mass in grams per mole is numerically equal to the molecular mass in daltons, so this figure doubles as the molecular weight.

Atomic weights are the IUPAC 2021 standard values. Several elements have a range rather than a single value because isotope ratios vary between sources; the conventional single value is used here.

Composition by mass

Element	Atoms	Atomic weight	Contribution (g/mol)	Share of mass
Oxygen (O)	3	15.999	47.997	52.117 %
Carbon (C)	3	12.011	36.033	39.126 %
Hydrogen (H)	8	1.008	8.064	8.7563 %

Contributions add to the molar mass of 92.094 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of glycerol?

92.094 g/mol, for the formula C₃H₈O₃.

How do you convert grams of glycerol to moles?

Divide the mass in grams by 92.094 g/mol. One gram of glycerol is 0.0108585 mol.

How many grams are in one mole of glycerol?

92.094 g, by definition of the molar mass.

Is molar mass the same as molecular weight?

Numerically yes, for the purposes of this calculation. Molecular weight is a dimensionless ratio and molar mass carries units of g/mol, but the digits are identical.

Where the numbers come from

IUPAC 2021 standard atomic weights; Avogadro constant fixed by the 2019 SI.