Molar mass of sodium chloride (NaCl)

The molar mass of sodium chloride (NaCl) is 58.4397693 g/mol, summed from the IUPAC standard atomic weights of Na, Cl.

Mass of sample

Amount of substance

mol

Molar mass

58.439 769 3g/mol

= Exact Molar mass of sodium chloride

Moles in the sample mass: 0.171 116 35 mol
Mass of that amount of substance: 58.439 769
Molecules in the sample mass: 1.03049e+23

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 22.98976928 + 35.45 = 58.4398
Moles in the sample mass = 10 / 58.4398 = 0.171 116
Mass of that amount of substance = 1 * 58.4398 = 58.4398
Molecules in the sample mass = 0.171 116 * NA = 1.03049e+23

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 NaCl: 22.98976928 + 35.45 = 58.4397693 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
Chlorine (Cl)	1	35.45	35.45	60.661 %
Sodium (Na)	1	22.98976928	22.989769	39.339 %

Contributions add to the molar mass of 58.4397693 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of sodium chloride?

58.4397693 g/mol, for the formula NaCl.

How do you convert grams of sodium chloride to moles?

Divide the mass in grams by 58.4397693 g/mol. One gram of sodium chloride is 0.0171116 mol.

How many grams are in one mole of sodium chloride?

58.4397693 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.