Molar Mass of Phosphorus pentoxide
P4O10 — 283.886 g/mol, worked out element by element.
Molar mass of Phosphorus pentoxide, P₄O₁₀
283.886 g/mol
Molecular weight 283.886 · 14 atoms per formula unit
Also known as: p4o10, p2o5.
The most aggressive drying agent in common use; its empirical formula P₂O₅ is not its molecular one.
How 283.886 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 10 | 15.999 | 159.990 | 56.36% |
| Phosphorus | 4 | 30.974 | 123.896 | 43.64% |
| Total | 14 | 283.886 | 100% |
M = 10 × 15.999 + 4 × 30.974 = 283.886 g/mol
Grams to moles for Phosphorus pentoxide
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0035 mol | 2.121 × 10^21 |
| 10 g | 0.0352 mol | 2.121 × 10^22 |
| 25 g | 0.0881 mol | 5.303 × 10^22 |
| 50 g | 0.1761 mol | 1.061 × 10^23 |
| 100 g | 0.3523 mol | 2.121 × 10^23 |
| 250 g | 0.8806 mol | 5.303 × 10^23 |
| 283.886 g | 1 mol | 6.022 × 10^23 |
For any other amount, use the molar mass calculator, or the molarity calculator to make up a solution of a given concentration.
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Frequently Asked Questions
What is the molar mass of Phosphorus pentoxide?
The molar mass of Phosphorus pentoxide (P4O10) is 283.886 g/mol. That is the sum of the standard atomic weights of all 14 atoms in one formula unit: 10 × 15.999 + 4 × 30.974 = 283.886.
What is the molecular weight of Phosphorus pentoxide?
283.886 — the same number as the molar mass, but as a dimensionless ratio rather than in g/mol. The two terms describe the same arithmetic, so a molecular weight of 283.89 and a molar mass of 283.89 g/mol are the same answer.
How many moles are in 100 g of Phosphorus pentoxide?
100 ÷ 283.886 = 0.3523 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Phosphorus pentoxide?
By mass, Phosphorus pentoxide is 56.36% oxygen, 43.64% phosphorus. Each element's share is its total mass in the formula divided by 283.886.
How many atoms are in one formula unit of Phosphorus pentoxide?
14: 10 oxygen, 4 phosphorus. One mole contains 6.02214076 × 10²³ formula units, so a mole of Phosphorus pentoxide contains 14 × 6.022 × 10²³ atoms in total.