Molar Mass of Calcium carbonate
CaCO3 — 100.086 g/mol, worked out element by element.
Molar mass of Calcium carbonate, CaCO₃
100.086 g/mol
Molecular weight 100.086 · 5 atoms per formula unit
Also known as: caco3, limestone, chalk, calcite, marble.
Limestone, chalk, marble and shell are all this compound; heating it drives off CO₂ to make lime.
How 100.086 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 3 | 15.999 | 47.997 | 47.96% |
| Calcium | 1 | 40.078 | 40.078 | 40.04% |
| Carbon | 1 | 12.011 | 12.011 | 12.00% |
| Total | 5 | 100.086 | 100% |
M = 3 × 15.999 + 1 × 40.078 + 1 × 12.011 = 100.086 g/mol
Grams to moles for Calcium carbonate
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0100 mol | 6.017 × 10^21 |
| 10 g | 0.0999 mol | 6.017 × 10^22 |
| 25 g | 0.2498 mol | 1.504 × 10^23 |
| 50 g | 0.4996 mol | 3.008 × 10^23 |
| 100 g | 0.9991 mol | 6.017 × 10^23 |
| 250 g | 2.4979 mol | 1.504 × 10^24 |
| 100.086 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 Calcium carbonate?
The molar mass of Calcium carbonate (CaCO3) is 100.086 g/mol. That is the sum of the standard atomic weights of all 5 atoms in one formula unit: 3 × 15.999 + 1 × 40.078 + 1 × 12.011 = 100.086.
What is the molecular weight of Calcium carbonate?
100.086 — 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 100.09 and a molar mass of 100.09 g/mol are the same answer.
How many moles are in 100 g of Calcium carbonate?
100 ÷ 100.086 = 0.9991 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Calcium carbonate?
By mass, Calcium carbonate is 47.96% oxygen, 40.04% calcium, 12.00% carbon. Each element's share is its total mass in the formula divided by 100.086.
How many atoms are in one formula unit of Calcium carbonate?
5: 3 oxygen, 1 calcium, 1 carbon. One mole contains 6.02214076 × 10²³ formula units, so a mole of Calcium carbonate contains 5 × 6.022 × 10²³ atoms in total.