Molar mass of trisodium citrate (C₆H₅Na₃O₇)

The molar mass of trisodium citrate (C₆H₅Na₃O₇) is 258.068308 g/mol, summed from the IUPAC standard atomic weights of C x 6, H x 5, Na x 3, O x 7.

Mass of sample

Amount of substance

mol

Molar mass

258.068 308g/mol

= Exact Molar mass of trisodium citrate

Moles in the sample mass: 0.038 749 431 mol
Mass of that amount of substance: 258.068 31
Molecules in the sample mass: 2.33355e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 12.011*6 + 1.008*5 + 22.98976928*3 + 15.999*7 = 258.068
Moles in the sample mass = 10 / 258.068 = 0.038 749 4
Mass of that amount of substance = 1 * 258.068 = 258.068
Molecules in the sample mass = 0.038 749 4 * NA = 2.33355e+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 C₆H₅Na₃O₇: 12.011 x 6 + 1.008 x 5 + 22.98976928 x 3 + 15.999 x 7 = 258.068308 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)	7	15.999	111.993	43.397 %
Carbon (C)	6	12.011	72.066	27.925 %
Sodium (Na)	3	22.98976928	68.969308	26.725 %
Hydrogen (H)	5	1.008	5.04	1.953 %

Contributions add to the molar mass of 258.068308 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of trisodium citrate?

258.068308 g/mol, for the formula C₆H₅Na₃O₇.

How do you convert grams of trisodium citrate to moles?

Divide the mass in grams by 258.068308 g/mol. One gram of trisodium citrate is 0.00387494 mol.

How many grams are in one mole of trisodium citrate?

258.068308 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.