Moles to grams for titanium dioxide is a multiplication by 79.865 g/mol. A mole weighs 79.865 g, 100 mmol weighs 7.9865 g, 10 mmol weighs 0.79865 g and a millimole is 79.865 mg. Those four figures cover most of what gets weighed out in practice, and the table below extends them from a micromole up to ten moles.
The figure comes from the formula. Titanium dioxide is 47.867 (Ti) + 2 × 15.999 (O), which is 79.865 g/mol, taking standard atomic weights, and every page here computes that sum rather than quoting it. Titanium makes up the largest share of the mass: 1 of the 3 atoms in a formula unit is titanium, and they account for 47.867 g of the 79.865 g, or 59.93% by mass. The derivation table below breaks the whole molecule down element by element.
Two habits make the weighed mass match the calculation. Weigh into a container you have tared rather than onto paper, because what stays behind on paper is a real loss — on a 100 mg weighing it is easily a percent. And when the target is under about 20 mg, weigh ten times that and dilute, since the absolute error of the balance does not shrink with the sample.
The white pigment in paint, sunscreen and toothpaste, and the most opaque white known. Also a photocatalyst under ultraviolet light. At 79.865 g/mol it is heavier than 3 of the 8 oxides covered here, and that ranking matters more than it looks: copper(II) oxide has a molar mass of 79.545 g/mol, so a gram of it contains 0.402% more formula units than a gram of titanium dioxide. Weigh by mass and you are not weighing equal amounts of substance.
Purity is the usual gap between the calculation and the balance. A reagent sold at 98% means 1.5973 g of a nominal 79.865 g is something else, so for exact work you divide the weighed mass by the assay figure on the certificate. For most purposes the difference is smaller than the error in reading the meniscus, but it is systematic rather than random, so it does not average out.
The formula
n- The amount of titanium dioxide you need, in moles
79.865- The molar mass of titanium dioxide in g/mol, derived from its formula
m- The mass to weigh out, in grams
How it works, step by step
- Enter the amount you need, in moles.
- It is multiplied by 79.865 g/mol.
- The result is the mass to weigh out, also given in milligrams.
- Weigh into a tared container; anything left in the boat is a real loss from the amount you calculated.
Worked examples
5 mmol of titanium dioxide in grams
5 mmol × 79.865 g/mol = 0.399325 g, which is 399.325 mg. Doubling the amount doubles the mass to 0.79865 g, because the relationship is a plain proportion once the molar mass is fixed.
250 mmol of titanium dioxide in grams
250 mmol × 79.865 g/mol = 19.9662 g, which is 19,966.2 mg. Doubling the amount doubles the mass to 39.9325 g, because the relationship is a plain proportion once the molar mass is fixed.
2 mol of titanium dioxide in grams
2 mol × 79.865 g/mol = 159.73 g, which is 159,730 mg. Doubling the amount doubles the mass to 319.46 g, because the relationship is a plain proportion once the molar mass is fixed.
How to read your score
Frequently asked questions
What is the molar mass of titanium dioxide (TiO2)?
It is 79.865 g/mol. That is the sum of the standard atomic weights of every atom in the formula: 47.867 (Ti) + 2 × 15.999 (O). One mole of titanium dioxide therefore weighs 79.865 g, and a gram of it is 12.521 mmol.
What percentage of titanium dioxide is titanium?
59.93% by mass. Each formula unit contains 1 titanium atom contributing 47.867 g of the 79.865 g total, so 100 g of titanium dioxide contains 59.93 g of titanium and a kilogram contains 599.35 g of it.
How many grams is one mole of titanium dioxide?
79.865 g, by definition of the molar mass. Two moles is 159.73 g and half a mole is 39.9325 g.
How many grams is 0.1 mol, and how many milligrams is 1 mmol?
0.1 mol of titanium dioxide is 7.9865 g. One millimole is 79.865 mg and one micromole is 79.865 µg, which is the range most bench work sits in.
How do I weigh out an amount too small for my balance?
Weigh a larger mass and dilute it. To get 0.7986 mg of titanium dioxide, weigh 7.986 mg into 100 mL, then take 10 mL of that: the absolute error of the balance stays the same while the amount delivered falls by a factor of ten.
Should I use the hydrate or the anhydrous molar mass?
This page is the anhydrous form, TiO2, at 79.865 g/mol. If your jar is the other form the molar mass differs and so will every mass you weigh, so check the label before using the figure. Salts that are sold as hydrates weigh more per mole because the water is part of the crystal.
Moles to grams reference for titanium dioxide
| Element | Atoms | Atomic weight | Contribution (g/mol) | By mass |
|---|---|---|---|---|
| Titanium (Ti) | 1 | 47.867 | 47.867 | 59.93% |
| Oxygen (O) | 2 | 15.999 | 31.998 | 40.07% |
| Total — one mole of titanium dioxide | 79.865 | 100% |
Standard atomic weights, IUPAC 2021. The contribution column is atoms × atomic weight, and the total is the molar mass this page uses: 79.865 g/mol.
| Wanted | Weigh (g) | Weigh (mg) | With 2% over (g) |
|---|---|---|---|
| 1 µmol | 0.000080 | 0.079865 | 0.000081 |
| 10 µmol | 0.00079865 | 0.79865 | 0.000814623 |
| 100 µmol | 0.0079865 | 7.9865 | 0.00814623 |
| 1 mmol | 0.079865 | 79.865 | 0.0814623 |
| 10 mmol | 0.79865 | 798.65 | 0.814623 |
| 50 mmol | 3.99325 | 3993.25 | 4.07311 |
| 100 mmol | 7.9865 | 7986.5 | 8.14623 |
| 250 mmol | 19.9662 | 19,966.2 | 20.3656 |
| 500 mmol | 39.9325 | 39,932.5 | 40.7311 |
| 750 mmol | 59.8987 | 59,898.7 | 61.0967 |
| 1 mol | 79.865 | 79,865 | 81.4623 |
| 2 mol | 159.73 | 159,730 | 162.925 |
| 5 mol | 399.325 | 399,325 | 407.312 |
| 10 mol | 798.65 | 798,650 | 814.623 |
Weigh is the amount multiplied by 79.865 g/mol. The last column carries a 2% allowance, which is what you take when some of the solid will be left in the weighing boat.
| Compound | Formula | Molar mass (g/mol) | Millimoles in 1 g |
|---|---|---|---|
| Calcium oxide | CaO | 56.077 | 17.833 |
| Silicon dioxide | SiO2 | 60.083 | 16.644 |
| Copper(II) oxide | CuO | 79.545 | 12.572 |
| Titanium dioxide (this page) | TiO2 | 79.865 | 12.521 |
| Zinc oxide | ZnO | 81.379 | 12.288 |
| Manganese dioxide | MnO2 | 86.93604 | 11.503 |
| Aluminium oxide | Al2O3 | 101.9601 | 9.8078 |
Ordered by molar mass. The last column is 1000/M, which is the number a weighed gram actually gives you.