Molar Mass of Potassium iodide
KI — 165.998 g/mol, worked out element by element.
Molar mass of Potassium iodide, KI
165.998 g/mol
Molecular weight 165.998 · 2 atoms per formula unit
Also known as: ki.
The iodide in iodised salt, and the compound given to block radioiodine uptake.
How 165.998 g/mol is worked out
| Element | Atoms | Atomic mass | Mass | % of total |
|---|---|---|---|---|
| Iodine | 1 | 126.9 | 126.900 | 76.45% |
| Potassium | 1 | 39.098 | 39.098 | 23.55% |
| Total | 2 | 165.998 | 100% |
M = 1 × 126.900 + 1 × 39.098 = 165.998 g/mol
Grams to moles for Potassium iodide
| Mass | Moles | Formula units |
|---|---|---|
| 1 g | 0.0060 mol | 3.628 × 10^21 |
| 10 g | 0.0602 mol | 3.628 × 10^22 |
| 25 g | 0.1506 mol | 9.070 × 10^22 |
| 50 g | 0.3012 mol | 1.814 × 10^23 |
| 100 g | 0.6024 mol | 3.628 × 10^23 |
| 250 g | 1.5060 mol | 9.070 × 10^23 |
| 165.998 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 iodide?
The molar mass of Potassium iodide (KI) is 165.998 g/mol. That is the sum of the standard atomic weights of all 2 atoms in one formula unit: 1 × 126.900 + 1 × 39.098 = 165.998.
What is the molecular weight of Potassium iodide?
165.998 — 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 166.00 and a molar mass of 166.00 g/mol are the same answer.
How many moles are in 100 g of Potassium iodide?
100 ÷ 165.998 = 0.6024 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 iodide?
By mass, Potassium iodide is 76.45% iodine, 23.55% potassium. Each element's share is its total mass in the formula divided by 165.998.
How many atoms are in one formula unit of Potassium iodide?
2: 1 iodine, 1 potassium. One mole contains 6.02214076 × 10²³ formula units, so a mole of Potassium iodide contains 2 × 6.022 × 10²³ atoms in total.