Molar mass of lead(ii) sulfate (PbSO₄)

The molar mass of lead(ii) sulfate (PbSO₄) is 303.256 g/mol, summed from the IUPAC standard atomic weights of Pb, S, O x 4. The discharge product in a lead-acid battery.

Mass of sample

Amount of substance

mol

Molar mass

303.256g/mol

= Exact Molar mass of lead(ii) sulfate

Moles in the sample mass: 0.032 975 44 mol
Mass of that amount of substance: 303.256
Molecules in the sample mass: 1.98583e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 207.2 + 32.06 + 15.999*4 = 303.256
Moles in the sample mass = 10 / 303.256 = 0.032 975 4
Mass of that amount of substance = 1 * 303.256 = 303.256
Molecules in the sample mass = 0.032 975 4 * NA = 1.98583e+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 PbSO₄: 207.2 + 32.06 + 15.999 x 4 = 303.256 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.

The discharge product in a lead-acid battery.

Composition by mass

Element	Atoms	Atomic weight	Contribution (g/mol)	Share of mass
Lead (Pb)	1	207.2	207.2	68.325 %
Oxygen (O)	4	15.999	63.996	21.103 %
Sulfur (S)	1	32.06	32.06	10.572 %

Contributions add to the molar mass of 303.256 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

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

303.256 g/mol, for the formula PbSO₄.

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

Divide the mass in grams by 303.256 g/mol. One gram of lead(ii) sulfate is 0.00329754 mol.

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

303.256 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.