Molar Mass of Paracetamol
C8H9NO2 — 151.165 g/mol, worked out element by element.
Molar mass of Paracetamol, C₈H₉NO₂
151.165 g/mol
Molecular weight 151.165 · 20 atoms per formula unit
Also known as: c8h9no2, acetaminophen, tylenol.
Acetaminophen in the US; the same molecule and the same molar mass under both names.
How 151.165 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Carbon | 8 | 12.011 | 96.088 | 63.56% |
| Oxygen | 2 | 15.999 | 31.998 | 21.17% |
| Nitrogen | 1 | 14.007 | 14.007 | 9.27% |
| Hydrogen | 9 | 1.008 | 9.072 | 6.00% |
| Total | 20 | 151.165 | 100% |
M = 8 × 12.011 + 2 × 15.999 + 1 × 14.007 + 9 × 1.008 = 151.165 g/mol
Grams to moles for Paracetamol
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0066 mol | 3.984 × 10^21 |
| 10 g | 0.0662 mol | 3.984 × 10^22 |
| 25 g | 0.1654 mol | 9.960 × 10^22 |
| 50 g | 0.3308 mol | 1.992 × 10^23 |
| 100 g | 0.6615 mol | 3.984 × 10^23 |
| 250 g | 1.6538 mol | 9.960 × 10^23 |
| 151.165 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 Paracetamol?
The molar mass of Paracetamol (C8H9NO2) is 151.165 g/mol. That is the sum of the standard atomic weights of all 20 atoms in one formula unit: 8 × 12.011 + 2 × 15.999 + 1 × 14.007 + 9 × 1.008 = 151.165.
What is the molecular weight of Paracetamol?
151.165 — 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 151.16 and a molar mass of 151.16 g/mol are the same answer.
How many moles are in 100 g of Paracetamol?
100 ÷ 151.165 = 0.6615 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Paracetamol?
By mass, Paracetamol is 63.56% carbon, 21.17% oxygen, 9.27% nitrogen, 6.00% hydrogen. Each element's share is its total mass in the formula divided by 151.165.
How many atoms are in one formula unit of Paracetamol?
20: 8 carbon, 2 oxygen, 1 nitrogen, 9 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Paracetamol contains 20 × 6.022 × 10²³ atoms in total.