Molar mass of sodium acetate (C₂H₃NaO₂)

The molar mass of sodium acetate (C₂H₃NaO₂) is 82.0337693 g/mol, summed from the IUPAC standard atomic weights of C x 2, H x 3, Na, O x 2.

Mass of sample

Amount of substance

mol

Molar mass

82.033 769 3g/mol

= Exact Molar mass of sodium acetate

Moles in the sample mass: 0.121 901 02 mol
Mass of that amount of substance: 82.033 769
Molecules in the sample mass: 7.34105e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 12.011*2 + 1.008*3 + 22.98976928 + 15.999*2 = 82.0338
Moles in the sample mass = 10 / 82.0338 = 0.121 901
Mass of that amount of substance = 1 * 82.0338 = 82.0338
Molecules in the sample mass = 0.121 901 * NA = 7.34105e+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 C₂H₃NaO₂: 12.011 x 2 + 1.008 x 3 + 22.98976928 + 15.999 x 2 = 82.0337693 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)	2	15.999	31.998	39.006 %
Carbon (C)	2	12.011	24.022	29.283 %
Sodium (Na)	1	22.98976928	22.989769	28.025 %
Hydrogen (H)	3	1.008	3.024	3.6863 %

Contributions add to the molar mass of 82.0337693 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of sodium acetate?

82.0337693 g/mol, for the formula C₂H₃NaO₂.

How do you convert grams of sodium acetate to moles?

Divide the mass in grams by 82.0337693 g/mol. One gram of sodium acetate is 0.0121901 mol.

How many grams are in one mole of sodium acetate?

82.0337693 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.