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Molar massPotassium iodide
Molar mass of KI (Potassium iodide)
The molar mass of KI is 166.00 g/mol.
A source of iodide ions for precipitation and halogen displacement.
Step-by-step calculation
Add up the atomic masses of every atom in the formula:
1 × 39.098 + 1 × 126.9 = 166.00 g/mol
| Element | Atoms | Atomic mass (u) | Subtotal (g/mol) | % by mass |
|---|---|---|---|---|
| Potassium (K) | 1 | 39.098 | 39.098 | 23.55% |
| Iodine (I) | 1 | 126.9 | 126.900 | 76.45% |
| Molar mass of KI | 166.00 g/mol | |||
Moles to grams for KI
Multiply the number of moles by 166.00 g/mol to get the mass, and divide a mass by 166.00 g/mol to get the moles.
| Amount (mol) | Mass (g) | Mass (g) | Amount (mol) |
|---|---|---|---|
| 0.1 mol | 16.60 g | 1 g | 0.0060 mol |
| 0.25 mol | 41.50 g | 5 g | 0.0301 mol |
| 0.5 mol | 83.00 g | 10 g | 0.0602 mol |
| 1 mol | 166.00 g | 50 g | 0.3012 mol |
| 2 mol | 332.00 g | 100 g | 0.6024 mol |
| 5 mol | 829.99 g | 500 g | 3.0121 mol |
Frequently asked questions
What is the molar mass of KI?
The molar mass of KI (potassium iodide) is 166.00 g/mol, so one mole of potassium iodide weighs 166.00 grams.
How do you calculate the molar mass of KI?
Multiply each element’s atomic mass by the number of atoms in the formula and add the results: 1 × 39.098 + 1 × 126.9 = 166.00 g/mol.
What percentage of KI is iodine?
Iodine makes up 76.45% of the mass of KI.
How many grams are in one mole of KI?
One mole of KI has a mass of 166.00 grams, and contains 6.022 × 10²³ formula units.