Molar mass of calcium phosphate (Ca₃(PO₄)₂)

The molar mass of calcium phosphate (Ca₃(PO₄)₂) is 310.173524 g/mol, summed from the IUPAC standard atomic weights of Ca x 3, P x 2, O x 8.

Mass of sample

Amount of substance

mol

Molar mass

310.173 524g/mol

= Exact Molar mass of calcium phosphate

Moles in the sample mass: 0.032 240 018 mol
Mass of that amount of substance: 310.173 52
Molecules in the sample mass: 1.94154e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 40.078*3 + 30.973761998*2 + 15.999*8 = 310.174
Moles in the sample mass = 10 / 310.174 = 0.032 24
Mass of that amount of substance = 1 * 310.174 = 310.174
Molecules in the sample mass = 0.032 24 * NA = 1.94154e+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 Ca₃(PO₄)₂: 40.078 x 3 + 30.973761998 x 2 + 15.999 x 8 = 310.173524 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)	8	15.999	127.992	41.265 %
Calcium (Ca)	3	40.078	120.234	38.763 %
Phosphorus (P)	2	30.973761998	61.947524	19.972 %

Contributions add to the molar mass of 310.173524 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of calcium phosphate?

310.173524 g/mol, for the formula Ca₃(PO₄)₂.

How do you convert grams of calcium phosphate to moles?

Divide the mass in grams by 310.173524 g/mol. One gram of calcium phosphate is 0.003224 mol.

How many grams are in one mole of calcium phosphate?

310.173524 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.