Molar mass of hepes (C₈H₁₈N₂O₄S)

The molar mass of hepes (C₈H₁₈N₂O₄S) is 238.302 g/mol, summed from the IUPAC standard atomic weights of C x 8, H x 18, N x 2, O x 4, S.

Mass of sample

Amount of substance

mol

Molar mass

238.302g/mol

= Exact Molar mass of hepes

Moles in the sample mass: 0.041 963 559 mol
Mass of that amount of substance: 238.302
Molecules in the sample mass: 2.5271e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 12.011*8 + 1.008*18 + 14.007*2 + 15.999*4 + 32.06 = 238.302
Moles in the sample mass = 10 / 238.302 = 0.041 963 6
Mass of that amount of substance = 1 * 238.302 = 238.302
Molecules in the sample mass = 0.041 963 6 * NA = 2.5271e+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 C₈H₁₈N₂O₄S: 12.011 x 8 + 1.008 x 18 + 14.007 x 2 + 15.999 x 4 + 32.06 = 238.302 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)	8	12.011	96.088	40.322 %
Oxygen (O)	4	15.999	63.996	26.855 %
Sulfur (S)	1	32.06	32.06	13.454 %
Nitrogen (N)	2	14.007	28.014	11.756 %
Hydrogen (H)	18	1.008	18.144	7.6139 %

Contributions add to the molar mass of 238.302 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of hepes?

238.302 g/mol, for the formula C₈H₁₈N₂O₄S.

How do you convert grams of hepes to moles?

Divide the mass in grams by 238.302 g/mol. One gram of hepes is 0.00419636 mol.

How many grams are in one mole of hepes?

238.302 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.