Molar mass of isoleucine (C₆H₁₃NO₂)

The molar mass of isoleucine (C₆H₁₃NO₂) is 131.175 g/mol, summed from the IUPAC standard atomic weights of C x 6, H x 13, N, O x 2.

Mass of sample

Amount of substance

mol

Molar mass

131.175g/mol

= Exact Molar mass of isoleucine

Moles in the sample mass: 0.076 234 038 mol
Mass of that amount of substance: 131.175
Molecules in the sample mass: 4.59092e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 12.011*6 + 1.008*13 + 14.007 + 15.999*2 = 131.175
Moles in the sample mass = 10 / 131.175 = 0.076 234
Mass of that amount of substance = 1 * 131.175 = 131.175
Molecules in the sample mass = 0.076 234 * NA = 4.59092e+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 C₆H₁₃NO₂: 12.011 x 6 + 1.008 x 13 + 14.007 + 15.999 x 2 = 131.175 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)	6	12.011	72.066	54.939 %
Oxygen (O)	2	15.999	31.998	24.393 %
Nitrogen (N)	1	14.007	14.007	10.678 %
Hydrogen (H)	13	1.008	13.104	9.9897 %

Contributions add to the molar mass of 131.175 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of isoleucine?

131.175 g/mol, for the formula C₆H₁₃NO₂.

How do you convert grams of isoleucine to moles?

Divide the mass in grams by 131.175 g/mol. One gram of isoleucine is 0.0076234 mol.

How many grams are in one mole of isoleucine?

131.175 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.