Molar Mass of Sulfurous acid
H2SO3 — 82.073 g/mol, worked out element by element.
Molar mass of Sulfurous acid, H₂SO₃
82.073 g/mol
Molecular weight 82.073 · 6 atoms per formula unit
Also known as: h2so3, sulphurous acid.
The weak acid formed when sulfur dioxide dissolves in water.
How 82.073 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 3 | 15.999 | 47.997 | 58.48% |
| Sulfur | 1 | 32.06 | 32.060 | 39.06% |
| Hydrogen | 2 | 1.008 | 2.016 | 2.46% |
| Total | 6 | 82.073 | 100% |
M = 3 × 15.999 + 1 × 32.060 + 2 × 1.008 = 82.073 g/mol
Grams to moles for Sulfurous acid
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0122 mol | 7.338 × 10^21 |
| 10 g | 0.1218 mol | 7.338 × 10^22 |
| 25 g | 0.3046 mol | 1.834 × 10^23 |
| 50 g | 0.6092 mol | 3.669 × 10^23 |
| 100 g | 1.2184 mol | 7.338 × 10^23 |
| 250 g | 3.0461 mol | 1.834 × 10^24 |
| 82.073 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 Sulfurous acid?
The molar mass of Sulfurous acid (H2SO3) is 82.073 g/mol. That is the sum of the standard atomic weights of all 6 atoms in one formula unit: 3 × 15.999 + 1 × 32.060 + 2 × 1.008 = 82.073.
What is the molecular weight of Sulfurous acid?
82.073 — 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 82.07 and a molar mass of 82.07 g/mol are the same answer.
How many moles are in 100 g of Sulfurous acid?
100 ÷ 82.073 = 1.2184 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Sulfurous acid?
By mass, Sulfurous acid is 58.48% oxygen, 39.06% sulfur, 2.46% hydrogen. Each element's share is its total mass in the formula divided by 82.073.
How many atoms are in one formula unit of Sulfurous acid?
6: 3 oxygen, 1 sulfur, 2 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Sulfurous acid contains 6 × 6.022 × 10²³ atoms in total.