Molar mass of dolomite (CaMg(CO₃)₂)

The molar mass of dolomite (CaMg(CO₃)₂) is 184.399 g/mol, summed from the IUPAC standard atomic weights of Ca, Mg, C x 2, O x 6.

Mass of sample

Amount of substance

mol

Molar mass

184.399g/mol

= Exact Molar mass of dolomite

Moles in the sample mass: 0.054 230 229 mol
Mass of that amount of substance: 184.399
Molecules in the sample mass: 3.26582e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 40.078 + 24.305 + 12.011*2 + 15.999*6 = 184.399
Moles in the sample mass = 10 / 184.399 = 0.054 230 2
Mass of that amount of substance = 1 * 184.399 = 184.399
Molecules in the sample mass = 0.054 230 2 * NA = 3.26582e+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 CaMg(CO₃)₂: 40.078 + 24.305 + 12.011 x 2 + 15.999 x 6 = 184.399 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)	6	15.999	95.994	52.058 %
Calcium (Ca)	1	40.078	40.078	21.734 %
Magnesium (Mg)	1	24.305	24.305	13.181 %
Carbon (C)	2	12.011	24.022	13.027 %

Contributions add to the molar mass of 184.399 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of dolomite?

184.399 g/mol, for the formula CaMg(CO₃)₂.

How do you convert grams of dolomite to moles?

Divide the mass in grams by 184.399 g/mol. One gram of dolomite is 0.00542302 mol.

How many grams are in one mole of dolomite?

184.399 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.