Molar Mass of P2O5 (Phosphorus Pentoxide)

Molar Mass Calculator
Chemical formula Write symbols with a capital letter: CoCl2 is cobalt chloride, COCl2 is phosgene. A hydrate takes a dot: CuSO4·5H2O or CuSO4.5H2O

What is the molar mass of P2O5?

Answer

M(P2O5) =
141.943 g/mol

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

Contribution of each element
Element Atoms, n Atomic weight, A n × A, g/mol Mass fraction, w
Pphosphorus230.97461.948 w ≈ 43.64%
Ooxygen515.99979.995 w ≈ 56.36%
Σ = 141.943 g/mol w = 100%

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

Mass fractions of the elements

Related Calculations

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Recalculate with different values ↑

Molar masses of substances nearby

FormulaM, g/mol
Pr (praseodymium)140.91
NaMnO₄ (sodium permanganate)141.924
AsH₃O₄ (arsenic acid)141.942
P₂O₅ (phosphorus pentoxide)141.943
Na₂HPO₄ (dibasic sodium phosphate)141.958
Na₂SO₄ (sodium sulfate)142.04
C₁₀H₂₂ (decane)142.286

FAQ

What is the molar mass of P2O5?

M(P₂O₅) = 141.943 g/mol

How to calculate the molar mass of P₂O₅?

Add up the atomic weights of all the atoms in the formula: 2 × 30.974 + 5 × 15.999 = 141.943 g/mol.

How many grams are in 2 moles of P₂O₅?

m = n × M = 2 mol × 141.943 g/mol = 283.886 g.

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