Molar Mass of PCl5 (Phosphorus Pentachloride)

Molar Mass Calculator

What is the molar mass of PCl₅?

Answer

M(PCl₅) ≈

208.22 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024); the sum is rounded to the decimal places of the least precise one — Cl: 35.45.

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Pphosphorus	1	30.974	30.974 w ≈ 14.88%	≈ 14.88%
Clchlorine	5	35.45	177.25 w ≈ 85.12%	≈ 85.12%
Σ = 208.224 ≈ 208.22 g/mol w = 100%				100%

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

Mass fractions of the elements

Cl 85.12%

P 14.88%

Related Calculations

See Also

Liters to Kilograms - How many kilograms are in a liter of water, honey, gasoline, sand and other substances — by density
Grams to Kg - Convert Grams to Kilograms
Percentage Calculator: Fraction to Percent - What percentage one number is of another? Convert fraction into a percentage
Scientific Calculator with Memory & History - Free Engineering Calculator Online with Memory Function, Operation History, Logarithms & Trigonometry. Similar to ti-83, ti-84, ti-89

Recalculate with different values ↑

Molar masses of substances nearby

Formula	M, g/mol
Tl (thallium)	204.38
Ca(ClO₃)₂ (calcium chlorate)	206.97
Pb (lead)	207.2
PCl₅ (phosphorus pentachloride)	208.22
BaCl₂ (barium chloride)	208.23
Bi (bismuth)	208.98
Sr(NO₃)₂ (strontium nitrate)	211.63

FAQ

What is the molar mass of PCl5?

M(PCl₅) ≈ 208.22 g/mol

How to calculate the molar mass of PCl₅?

Add up the atomic weights of all the atoms in the formula: 30.974 + 5 × 35.45 = 208.224 ≈ 208.22 g/mol.

How many grams are in 2 moles of PCl₅?

m = n × M = 2 mol × 208.22 g/mol = 416.44 g.

See Also