Molar Mass of Oxalic acid
H2C2O4 — 90.034 g/mol, worked out element by element.
Molar mass of Oxalic acid, H₂C₂O₄
90.034 g/mol
Molecular weight 90.034 · 8 atoms per formula unit
Also known as: h2c2o4, ethanedioic acid.
A diprotic acid used to standardise permanganate solutions, and the reason rhubarb leaves are toxic.
How 90.034 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 4 | 15.999 | 63.996 | 71.08% |
| Carbon | 2 | 12.011 | 24.022 | 26.68% |
| Hydrogen | 2 | 1.008 | 2.016 | 2.24% |
| Total | 8 | 90.034 | 100% |
M = 4 × 15.999 + 2 × 12.011 + 2 × 1.008 = 90.034 g/mol
Grams to moles for Oxalic acid
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0111 mol | 6.689 × 10^21 |
| 10 g | 0.1111 mol | 6.689 × 10^22 |
| 25 g | 0.2777 mol | 1.672 × 10^23 |
| 50 g | 0.5553 mol | 3.344 × 10^23 |
| 100 g | 1.1107 mol | 6.689 × 10^23 |
| 250 g | 2.7767 mol | 1.672 × 10^24 |
| 90.034 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 Oxalic acid?
The molar mass of Oxalic acid (H2C2O4) is 90.034 g/mol. That is the sum of the standard atomic weights of all 8 atoms in one formula unit: 4 × 15.999 + 2 × 12.011 + 2 × 1.008 = 90.034.
What is the molecular weight of Oxalic acid?
90.034 — 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 90.03 and a molar mass of 90.03 g/mol are the same answer.
How many moles are in 100 g of Oxalic acid?
100 ÷ 90.034 = 1.1107 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Oxalic acid?
By mass, Oxalic acid is 71.08% oxygen, 26.68% carbon, 2.24% hydrogen. Each element's share is its total mass in the formula divided by 90.034.
How many atoms are in one formula unit of Oxalic acid?
8: 4 oxygen, 2 carbon, 2 hydrogen. One mole contains 6.02214076 × 10²³ formula units, so a mole of Oxalic acid contains 8 × 6.022 × 10²³ atoms in total.