Molar mass of potassium ferrocyanide (K₄[Fe(CN)₆])

The molar mass of potassium ferrocyanide (K₄[Fe(CN)₆]) is 368.3462 g/mol, summed from the IUPAC standard atomic weights of K x 4, Fe, C x 6, N x 6.

Mass of sample

Amount of substance

mol

Molar mass

368.3462g/mol

= Exact Molar mass of potassium ferrocyanide

Moles in the sample mass: 0.027 148 373 mol
Mass of that amount of substance: 368.3462
Molecules in the sample mass: 1.63491e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 39.0983*4 + 55.845 + 12.011*6 + 14.007*6 = 368.346
Moles in the sample mass = 10 / 368.346 = 0.027 148 4
Mass of that amount of substance = 1 * 368.346 = 368.346
Molecules in the sample mass = 0.027 148 4 * NA = 1.63491e+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 K₄[Fe(CN)₆]: 39.0983 x 4 + 55.845 + 12.011 x 6 + 14.007 x 6 = 368.3462 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
Potassium (K)	4	39.0983	156.3932	42.458 %
Nitrogen (N)	6	14.007	84.042	22.816 %
Carbon (C)	6	12.011	72.066	19.565 %
Iron (Fe)	1	55.845	55.845	15.161 %

Contributions add to the molar mass of 368.3462 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of potassium ferrocyanide?

368.3462 g/mol, for the formula K₄[Fe(CN)₆].

How do you convert grams of potassium ferrocyanide to moles?

Divide the mass in grams by 368.3462 g/mol. One gram of potassium ferrocyanide is 0.00271484 mol.

How many grams are in one mole of potassium ferrocyanide?

368.3462 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.