Result
FeCl₃ contains one iron atom and three chlorine atoms.
Calculator Inputs
Element Breakdown
| Element | Atomic mass | Atoms | Contribution | Mass percent |
|---|---|---|---|---|
| Iron (Fe) | 55.845 g/mol | 1 | 55.845 g/mol | 34.431% |
| Chlorine (Cl) | 35.450 g/mol | 3 | 106.350 g/mol | 65.569% |
Grams to Moles
Enter sample grams above to calculate moles.
Moles to Grams
Enter sample moles above to calculate grams.
Formula Used
The calculator adds one iron atomic mass to three chlorine atomic masses.
How to Use This Calculator
Keep the default atomic masses for standard classroom calculations. Change them when your reference table uses different values. Select the decimal precision you want for displayed results. Add grams to convert sample mass into moles. Add moles to convert substance amount into grams. Press Calculate after changing any input values.
Example Calculation
| Step | Calculation | Result |
|---|---|---|
| Iron contribution | 1 × 55.845 | 55.845 g/mol |
| Chlorine contribution | 3 × 35.45 | 106.350 g/mol |
| Total molar mass | 55.845 + 106.350 | 162.195 g/mol |
About FeCl3 Molar Mass
Iron(III) chloride has the chemical formula FeCl₃. Each formula unit contains one iron atom. It also contains three chlorine atoms. Molar mass combines their atomic mass contributions. This value is expressed in grams per mole. Chemists use it for many quantity conversions. It connects measured mass with chemical amount. Accurate atomic weights improve calculation precision.
The iron contribution comes from one Fe atom. Its standard atomic weight is about 55.845. Chlorine contributes three times its atomic weight. A common chlorine value is about 35.45. Three chlorine atoms contribute about 106.35 total. Adding both contributions gives about 162.195 g/mol. Different reference tables may round values differently. This calculator therefore allows editable atomic masses.
Mass percentage shows each element's share by mass. Iron contributes about one third of the total. Chlorine contributes the larger remaining percentage. These values support composition and stoichiometry exercises. They also help explain formula relationships clearly. The breakdown table shows every calculation component. Students can compare atomic and molecular contributions easily. Precision settings support classroom and laboratory preferences.
Molar mass also converts grams into moles directly. Divide sample grams by the compound's molar mass. Converting moles back to grams uses multiplication. Multiply moles by the same molar mass. These conversions appear beside the main result. Optional inputs keep the basic calculator uncluttered. Download tools help preserve calculation details. Printed output can also become a PDF. The calculator provides a clear reusable chemistry reference.
FeCl₃ is commonly called iron(III) chloride. The Roman numeral identifies iron's oxidation state. The formula contains three chloride ions per iron. Molar mass itself does not describe reaction behavior. It only represents mass for one mole. Still, it is essential for stoichiometric calculations. Always confirm the atomic weights your course requires. Then calculate FeCl₃ quantities with consistent reference values.