Molar mass of propane (C₃H₈)

The molar mass of propane (C₃H₈) is 44.097 g/mol, summed from the IUPAC standard atomic weights of C x 3, H x 8.

Mass of sample

Amount of substance

mol

Molar mass

44.097g/mol

= Exact Molar mass of propane

Moles in the sample mass: 0.226 772 8 mol
Mass of that amount of substance: 44.097
Molecules in the sample mass: 1.36566e+23

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 12.011*3 + 1.008*8 = 44.097
Moles in the sample mass = 10 / 44.097 = 0.226 773
Mass of that amount of substance = 1 * 44.097 = 44.097
Molecules in the sample mass = 0.226 773 * NA = 1.36566e+23

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

Scenarios & local history

Compare a saved scenario

Recent calculations

The formula

Molar mass = sum over elements of (atomic weight x number of atoms)
For C₃H₈: 12.011 x 3 + 1.008 x 8 = 44.097 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
Carbon (C)	3	12.011	36.033	81.713 %
Hydrogen (H)	8	1.008	8.064	18.287 %

Contributions add to the molar mass of 44.097 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of propane?

44.097 g/mol, for the formula C₃H₈.

How do you convert grams of propane to moles?

Divide the mass in grams by 44.097 g/mol. One gram of propane is 0.0226773 mol.

How many grams are in one mole of propane?

44.097 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.