Molar mass of hydrogen sulfide (H₂S)

The molar mass of hydrogen sulfide (H₂S) is 34.076 g/mol, summed from the IUPAC standard atomic weights of H x 2, S.

Mass of sample

Amount of substance

mol

Molar mass

34.076g/mol

= Exact Molar mass of hydrogen sulfide

Moles in the sample mass: 0.293 461 67 mol
Mass of that amount of substance: 34.076
Molecules in the sample mass: 1.76727e+23

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 1.008*2 + 32.06 = 34.076
Moles in the sample mass = 10 / 34.076 = 0.293 462
Mass of that amount of substance = 1 * 34.076 = 34.076
Molecules in the sample mass = 0.293 462 * NA = 1.76727e+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.

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The formula

Molar mass = sum over elements of (atomic weight x number of atoms)
For H₂S: 1.008 x 2 + 32.06 = 34.076 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
Sulfur (S)	1	32.06	32.06	94.084 %
Hydrogen (H)	2	1.008	2.016	5.9162 %

Contributions add to the molar mass of 34.076 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of hydrogen sulfide?

34.076 g/mol, for the formula H₂S.

How do you convert grams of hydrogen sulfide to moles?

Divide the mass in grams by 34.076 g/mol. One gram of hydrogen sulfide is 0.0293462 mol.

How many grams are in one mole of hydrogen sulfide?

34.076 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.