Molar Mass of Caffeine
C8H10N4O2 — 194.194 g/mol, worked out element by element.
Molar mass of Caffeine, C₈H₁₀N₄O₂
194.194 g/mol
Molecular weight 194.194 · 24 atoms per formula unit
Also known as: c8h10n4o2.
Extracted from tea leaves in a classic separation experiment.
How 194.194 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Carbon | 8 | 12.011 | 96.088 | 49.48% |
| Nitrogen | 4 | 14.007 | 56.028 | 28.85% |
| Oxygen | 2 | 15.999 | 31.998 | 16.48% |
| Hydrogen | 10 | 1.008 | 10.080 | 5.19% |
| Total | 24 | 194.194 | 100% |
M = 8 × 12.011 + 4 × 14.007 + 2 × 15.999 + 10 × 1.008 = 194.194 g/mol
Grams to moles for Caffeine
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0051 mol | 3.101 × 10^21 |
| 10 g | 0.0515 mol | 3.101 × 10^22 |
| 25 g | 0.1287 mol | 7.753 × 10^22 |
| 50 g | 0.2575 mol | 1.551 × 10^23 |
| 100 g | 0.5149 mol | 3.101 × 10^23 |
| 250 g | 1.2874 mol | 7.753 × 10^23 |
| 194.194 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 Caffeine?
The molar mass of Caffeine (C8H10N4O2) is 194.194 g/mol. That is the sum of the standard atomic weights of all 24 atoms in one formula unit: 8 × 12.011 + 4 × 14.007 + 2 × 15.999 + 10 × 1.008 = 194.194.
What is the molecular weight of Caffeine?
194.194 — 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 194.19 and a molar mass of 194.19 g/mol are the same answer.
How many moles are in 100 g of Caffeine?
100 ÷ 194.194 = 0.5149 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Caffeine?
By mass, Caffeine is 49.48% carbon, 28.85% nitrogen, 16.48% oxygen, 5.19% hydrogen. Each element's share is its total mass in the formula divided by 194.194.
How many atoms are in one formula unit of Caffeine?
24: 8 carbon, 4 nitrogen, 2 oxygen, 10 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Caffeine contains 24 × 6.022 × 10²³ atoms in total.