Molar mass of sodium silicate (Na₂SiO₃)

The molar mass of sodium silicate (Na₂SiO₃) is 122.061539 g/mol, summed from the IUPAC standard atomic weights of Na x 2, Si, O x 3.

Mass of sample

Amount of substance

mol

Molar mass

122.061 539g/mol

= Exact Molar mass of sodium silicate

Moles in the sample mass: 0.081 925 889 mol
Mass of that amount of substance: 122.061 54
Molecules in the sample mass: 4.93369e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 22.98976928*2 + 28.085 + 15.999*3 = 122.062
Moles in the sample mass = 10 / 122.062 = 0.081 925 9
Mass of that amount of substance = 1 * 122.062 = 122.062
Molecules in the sample mass = 0.081 925 9 * NA = 4.93369e+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 Na₂SiO₃: 22.98976928 x 2 + 28.085 + 15.999 x 3 = 122.061539 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)	3	15.999	47.997	39.322 %
Sodium (Na)	2	22.98976928	45.979539	37.669 %
Silicon (Si)	1	28.085	28.085	23.009 %

Contributions add to the molar mass of 122.061539 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of sodium silicate?

122.061539 g/mol, for the formula Na₂SiO₃.

How do you convert grams of sodium silicate to moles?

Divide the mass in grams by 122.061539 g/mol. One gram of sodium silicate is 0.00819259 mol.

How many grams are in one mole of sodium silicate?

122.061539 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.