Molar mass of manganese(ii) sulfate (MnSO₄)

The molar mass of manganese(ii) sulfate (MnSO₄) is 150.994043 g/mol, summed from the IUPAC standard atomic weights of Mn, S, O x 4.

Mass of sample

Amount of substance

mol

Molar mass

150.994 043g/mol

= Exact Molar mass of manganese(ii) sulfate

Moles in the sample mass: 0.066 227 778 mol
Mass of that amount of substance: 150.994 04
Molecules in the sample mass: 3.98833e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 54.938043 + 32.06 + 15.999*4 = 150.994
Moles in the sample mass = 10 / 150.994 = 0.066 227 8
Mass of that amount of substance = 1 * 150.994 = 150.994
Molecules in the sample mass = 0.066 227 8 * NA = 3.98833e+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 MnSO₄: 54.938043 + 32.06 + 15.999 x 4 = 150.994043 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
Oxygen (O)	4	15.999	63.996	42.383 %
Manganese (Mn)	1	54.938043	54.938043	36.384 %
Sulfur (S)	1	32.06	32.06	21.233 %

Contributions add to the molar mass of 150.994043 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of manganese(ii) sulfate?

150.994043 g/mol, for the formula MnSO₄.

How do you convert grams of manganese(ii) sulfate to moles?

Divide the mass in grams by 150.994043 g/mol. One gram of manganese(ii) sulfate is 0.00662278 mol.

How many grams are in one mole of manganese(ii) sulfate?

150.994043 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.