Molar Mass of P4 (White Phosphorus)

Molar Mass Calculator

What is the molar mass of P₄?

Answer

M(P₄) =

123.896 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024).

One P atom: M(P) = 30.974 g/mol; P₄ is four atoms.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Pphosphorus	4	30.974	123.896 w = 100.00%	100.00%

Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)

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Molar Mass of P (Phosphorus): Step by Step

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Molar masses of substances nearby

Formula	M, g/mol
KClO₃	122.55
C₆H₅NO₂ (nitrobenzene)	123.111
CuCO₃ (copper(II) carbonate)	123.554
P₄ (white phosphorus)	123.896
C₇H₈O₂ (guaiacol)	124.139
ZnCO₃ (zinc carbonate)	125.39
SrF₂ (strontium fluoride)	125.62

FAQ

What is the molar mass of P4?

M(P₄) = 123.896 g/mol

How to calculate the molar mass of P₄?

Add up the atomic weights of all the atoms in the formula: 4 × 30.974 = 123.896 g/mol.

How many grams are in 2 moles of P₄?

m = n × M = 2 mol × 123.896 g/mol = 247.792 g.

See Also