Molar Mass of Potassium dichromate
K2Cr2O7 — 294.181 g/mol, worked out element by element.
Molar mass of Potassium dichromate, K₂Cr₂O₇
294.181 g/mol
Molecular weight 294.181 · 11 atoms per formula unit
Also known as: k2cr2o7.
An oxidising agent that goes orange to green on reduction — the original breathalyser chemistry.
How 294.181 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Oxygen | 7 | 15.999 | 111.993 | 38.07% |
| Chromium | 2 | 51.996 | 103.992 | 35.35% |
| Potassium | 2 | 39.098 | 78.196 | 26.58% |
| Total | 11 | 294.181 | 100% |
M = 7 × 15.999 + 2 × 51.996 + 2 × 39.098 = 294.181 g/mol
Grams to moles for Potassium dichromate
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0034 mol | 2.047 × 10^21 |
| 10 g | 0.0340 mol | 2.047 × 10^22 |
| 25 g | 0.0850 mol | 5.118 × 10^22 |
| 50 g | 0.1700 mol | 1.024 × 10^23 |
| 100 g | 0.3399 mol | 2.047 × 10^23 |
| 250 g | 0.8498 mol | 5.118 × 10^23 |
| 294.181 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 Potassium dichromate?
The molar mass of Potassium dichromate (K2Cr2O7) is 294.181 g/mol. That is the sum of the standard atomic weights of all 11 atoms in one formula unit: 7 × 15.999 + 2 × 51.996 + 2 × 39.098 = 294.181.
What is the molecular weight of Potassium dichromate?
294.181 — 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 294.18 and a molar mass of 294.18 g/mol are the same answer.
How many moles are in 100 g of Potassium dichromate?
100 ÷ 294.181 = 0.3399 mol. To convert any mass to moles, divide by the molar mass; to go the other way, multiply.
What is the percent composition of Potassium dichromate?
By mass, Potassium dichromate is 38.07% oxygen, 35.35% chromium, 26.58% potassium. Each element's share is its total mass in the formula divided by 294.181.
How many atoms are in one formula unit of Potassium dichromate?
11: 7 oxygen, 2 chromium, 2 potassium. One mole contains 6.02214076 × 10²³ formula units, so a mole of Potassium dichromate contains 11 × 6.022 × 10²³ atoms in total.