Molar Mass of Sodium Chloride

M(\mathrm{NaCl}) = 0.05844\ \text{kg/mol}

Value	0.05844 kg/mol
Status	Measured: ± 0.00001 kg/mol (0.00017 relative)
Source	IUPAC
Categories	Chemistry

Molar Mass of Sodium Chloride in every molar mass unit

gram per mole	58.44 g/mol
kilogram per kilomole	58.44 kg/kmol
milligram per millimole	58.44 mg/mmol
pound per pound-mole	58.44 lb/lb-mol
dalton (as molar mass)	58.44 Da
kilogram per mole	0.05844 kg/mol
kilodalton (as molar mass)	0.05844 kDa

Learning zone

Salt has no molecules, only a lattice, so 58.44 g/mol is strictly a formula mass: the mass of one mole of NaCl formula units. It is one of the few molar masses people use daily without noticing. Physiological saline at 0.9 % w/v is 9 g/L, which is 0.154 mol/L of NaCl and 0.308 osmol/L of particles once it dissociates — matched deliberately to blood plasma.

In water treatment the same figure sizes brine. A saturated NaCl brine at 20 °C holds about 26.4 % by mass, roughly 317 g/L or 5.4 mol/L, and an ion-exchange softener is dosed in kilograms of salt per cubic foot of resin against a theoretical exchange capacity expressed in equivalents. The uncertainty here, ±0.01 g/mol, comes almost entirely from chlorine, whose two stable isotopes vary enough between sources that IUPAC quotes the atomic weight only as 35.45.

Used by 3 solvers

Mass Percent of a Solution

c = \frac{m_{\text{solute}}}{m_{\text{solution}}} \times 100\%

Molarity (C = n/V)

C = \frac{n}{V}

Moles from Mass (n = m/M)

n = \frac{m}{M}