Molar Mass of Aspirin
C9H8O4 — 180.159 g/mol, worked out element by element.
Molar mass of Aspirin, C₉H₈O₄
180.159 g/mol
Molecular weight 180.159 · 21 atoms per formula unit
Also known as: c9h8o4, acetylsalicylic acid.
Acetylsalicylic acid — the synthesis and the purity assay are both standard practicals.
How 180.159 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Carbon | 9 | 12.011 | 108.099 | 60.00% |
| Oxygen | 4 | 15.999 | 63.996 | 35.52% |
| Hydrogen | 8 | 1.008 | 8.064 | 4.48% |
| Total | 21 | 180.159 | 100% |
M = 9 × 12.011 + 4 × 15.999 + 8 × 1.008 = 180.159 g/mol
Grams to moles for Aspirin
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0056 mol | 3.343 × 10^21 |
| 10 g | 0.0555 mol | 3.343 × 10^22 |
| 25 g | 0.1388 mol | 8.357 × 10^22 |
| 50 g | 0.2775 mol | 1.671 × 10^23 |
| 100 g | 0.5551 mol | 3.343 × 10^23 |
| 250 g | 1.3877 mol | 8.357 × 10^23 |
| 180.159 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 Aspirin?
The molar mass of Aspirin (C9H8O4) is 180.159 g/mol. That is the sum of the standard atomic weights of all 21 atoms in one formula unit: 9 × 12.011 + 4 × 15.999 + 8 × 1.008 = 180.159.
What is the molecular weight of Aspirin?
180.159 — 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 180.16 and a molar mass of 180.16 g/mol are the same answer.
How many moles are in 100 g of Aspirin?
100 ÷ 180.159 = 0.5551 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Aspirin?
By mass, Aspirin is 60.00% carbon, 35.52% oxygen, 4.48% hydrogen. Each element's share is its total mass in the formula divided by 180.159.
How many atoms are in one formula unit of Aspirin?
21: 9 carbon, 4 oxygen, 8 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Aspirin contains 21 × 6.022 × 10²³ atoms in total.