Molar mass of ammonium phosphate ((NH₄)₃PO₄)

The molar mass of ammonium phosphate ((NH₄)₃PO₄) is 149.086762 g/mol, summed from the IUPAC standard atomic weights of N x 3, H x 12, P, O x 4.

Mass of sample

Amount of substance

mol

Molar mass

149.086 762g/mol

= Exact Molar mass of ammonium phosphate

Moles in the sample mass: 0.067 075 036 mol
Mass of that amount of substance: 149.086 76
Molecules in the sample mass: 4.03935e+22

Show the working

Mass of sample = 10
Amount of substance = 1
Molar mass = 14.007*3 + 1.008*12 + 30.973761998 + 15.999*4 = 149.087
Moles in the sample mass = 10 / 149.087 = 0.067 075
Mass of that amount of substance = 1 * 149.087 = 149.087
Molecules in the sample mass = 0.067 075 * NA = 4.03935e+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 (NH₄)₃PO₄: 14.007 x 3 + 1.008 x 12 + 30.973761998 + 15.999 x 4 = 149.086762 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)	4	15.999	63.996	42.925 %
Nitrogen (N)	3	14.007	42.021	28.186 %
Phosphorus (P)	1	30.973761998	30.973762	20.776 %
Hydrogen (H)	12	1.008	12.096	8.1134 %

Contributions add to the molar mass of 149.086762 g/mol. Atomic weights are the IUPAC 2021 standard values.

Frequently asked

What is the molar mass of ammonium phosphate?

149.086762 g/mol, for the formula (NH₄)₃PO₄.

How do you convert grams of ammonium phosphate to moles?

Divide the mass in grams by 149.086762 g/mol. One gram of ammonium phosphate is 0.0067075 mol.

How many grams are in one mole of ammonium phosphate?

149.086762 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.