Molar Mass of Formaldehyde
CH2O — 30.026 g/mol, worked out element by element.
Molar mass of Formaldehyde, CH₂O
30.026 g/mol
Molecular weight 30.026 · 4 atoms per formula unit
Also known as: ch2o, methanal.
The simplest aldehyde, and the empirical formula of every simple sugar.
How 30.026 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 1 | 15.999 | 15.999 | 53.28% |
| Carbon | 1 | 12.011 | 12.011 | 40.00% |
| Hydrogen | 2 | 1.008 | 2.016 | 6.71% |
| Total | 4 | 30.026 | 100% |
M = 1 × 15.999 + 1 × 12.011 + 2 × 1.008 = 30.026 g/mol
Grams to moles for Formaldehyde
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0333 mol | 2.006 × 10^22 |
| 10 g | 0.3330 mol | 2.006 × 10^23 |
| 25 g | 0.8326 mol | 5.014 × 10^23 |
| 50 g | 1.6652 mol | 1.003 × 10^24 |
| 100 g | 3.3304 mol | 2.006 × 10^24 |
| 250 g | 8.3261 mol | 5.014 × 10^24 |
| 30.026 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.
Related compounds
Can't find the exact calculator you need?
Describe it in one sentence — get a working, math-verified calculator in seconds. Free, no signup.
Build your own calculatorRelated Calculators
Frequently Asked Questions
What is the molar mass of Formaldehyde?
The molar mass of Formaldehyde (CH2O) is 30.026 g/mol. That is the sum of the standard atomic weights of all 4 atoms in one formula unit: 1 × 15.999 + 1 × 12.011 + 2 × 1.008 = 30.026.
What is the molecular weight of Formaldehyde?
30.026 — 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 30.03 and a molar mass of 30.03 g/mol are the same answer.
How many moles are in 100 g of Formaldehyde?
100 ÷ 30.026 = 3.3304 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Formaldehyde?
By mass, Formaldehyde is 53.28% oxygen, 40.00% carbon, 6.71% hydrogen. Each element's share is its total mass in the formula divided by 30.026.
How many atoms are in one formula unit of Formaldehyde?
4: 1 oxygen, 1 carbon, 2 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Formaldehyde contains 4 × 6.022 × 10²³ atoms in total.