Molar Mass of Hydrofluoric acid
HF — 20.006 g/mol, worked out element by element.
Molar mass of Hydrofluoric acid, HF
20.006 g/mol
Molecular weight 20.006 · 2 atoms per formula unit
Also known as: hf.
A weak acid that nonetheless etches glass, because fluoride attacks silicon rather than donating protons well.
How 20.006 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Fluorine | 1 | 18.998 | 18.998 | 94.96% |
| Hydrogen | 1 | 1.008 | 1.008 | 5.04% |
| Total | 2 | 20.006 | 100% |
M = 1 × 18.998 + 1 × 1.008 = 20.006 g/mol
Grams to moles for Hydrofluoric acid
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0500 mol | 3.010 × 10^22 |
| 10 g | 0.4999 mol | 3.010 × 10^23 |
| 25 g | 1.2496 mol | 7.525 × 10^23 |
| 50 g | 2.4993 mol | 1.505 × 10^24 |
| 100 g | 4.9985 mol | 3.010 × 10^24 |
| 250 g | 12.4963 mol | 7.525 × 10^24 |
| 20.006 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 Hydrofluoric acid?
The molar mass of Hydrofluoric acid (HF) is 20.006 g/mol. That is the sum of the standard atomic weights of all 2 atoms in one formula unit: 1 × 18.998 + 1 × 1.008 = 20.006.
What is the molecular weight of Hydrofluoric acid?
20.006 — 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 20.01 and a molar mass of 20.01 g/mol are the same answer.
How many moles are in 100 g of Hydrofluoric acid?
100 ÷ 20.006 = 4.9985 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Hydrofluoric acid?
By mass, Hydrofluoric acid is 94.96% fluorine, 5.04% hydrogen. Each element's share is its total mass in the formula divided by 20.006.
How many atoms are in one formula unit of Hydrofluoric acid?
2: 1 fluorine, 1 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Hydrofluoric acid contains 2 × 6.022 × 10²³ atoms in total.