Molar mass of fructose (C₆H₁₂O₆)

The molar mass of fructose (C₆H₁₂O₆) is 180.156 g/mol, summed from the IUPAC standard atomic weights of C x 6, H x 12, O x 6. An isomer of glucose: the same formula and the same molar mass, a different structure.

Mass of sample

Amount of substance

mol

Molar mass

180.156g/mol

= Exact Molar mass of fructose

Moles in the sample mass: 0.055 507 449 mol
Mass of that amount of substance: 180.156
Molecules in the sample mass: 3.34274e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 12.011*6 + 1.008*12 + 15.999*6 = 180.156
Moles in the sample mass = 10 / 180.156 = 0.055 507 4
Mass of that amount of substance = 1 * 180.156 = 180.156
Molecules in the sample mass = 0.055 507 4 * NA = 3.34274e+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 C₆H₁₂O₆: 12.011 x 6 + 1.008 x 12 + 15.999 x 6 = 180.156 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.

An isomer of glucose: the same formula and the same molar mass, a different structure.

Composition by mass

Element	Atoms	Atomic weight	Contribution (g/mol)	Share of mass
Oxygen (O)	6	15.999	95.994	53.284 %
Carbon (C)	6	12.011	72.066	40.002 %
Hydrogen (H)	12	1.008	12.096	6.7142 %

Contributions add to the molar mass of 180.156 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of fructose?

180.156 g/mol, for the formula C₆H₁₂O₆.

How do you convert grams of fructose to moles?

Divide the mass in grams by 180.156 g/mol. One gram of fructose is 0.00555074 mol.

How many grams are in one mole of fructose?

180.156 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.