Result
Fe₂O₃ has a standard molar mass of 159.687 g/mol.
Fe₂O₃ Calculator
Scientific notation is supported by modern number fields when typed directly.
Formula Used
Using Fe = 55.845 and O = 15.999 gives 159.687 g/mol.
Element Breakdown
| Element | Atomic Mass | Atoms | Contribution | Mass Percentage |
|---|---|---|---|---|
| Iron (Fe) | 55.845 | 2 | 111.690 g/mol | 69.94% |
| Oxygen (O) | 15.999 | 3 | 47.997 g/mol | 30.06% |
| Total | 159.687 g/mol | 100.00% | ||
Example Conversion Table
| Fe₂O₃ Amount | Moles | Mass | Formula Units |
|---|---|---|---|
| 0.10 mol | 0.10 mol | 15.9687 g | 6.022 × 10²² |
| 0.50 mol | 0.50 mol | 79.8435 g | 3.011 × 10²³ |
| 1.00 mol | 1.00 mol | 159.687 g | 6.022 × 10²³ |
| 2.00 mol | 2.00 mol | 319.374 g | 1.204 × 10²⁴ |
| 5.00 mol | 5.00 mol | 798.435 g | 3.011 × 10²⁴ |
How to Use This Calculator
Enter any positive quantity in the amount field. Choose the unit matching your starting quantity. Then choose the unit needed for your answer.
Select your preferred decimal precision before calculating. Press Calculate to update the result immediately. Use Copy Result for quick reuse elsewhere.
CSV export saves structured calculation data locally. PDF export creates a compact downloadable report. Print provides a printer friendly record.
Understanding Fe₂O₃ Molar Mass
Iron(III) oxide has the chemical formula Fe₂O₃. The formula contains two iron atoms. It also contains three oxygen atoms.
Molar mass describes one mole of a substance. Its common unit is grams per mole. Chemists use it for mass conversions.
Iron contributes most of Fe₂O₃ total mass. Two iron atoms contribute 111.690 grams per mole. Three oxygen atoms contribute 47.997 grams.
Adding both contributions gives 159.687 grams per mole. This value supports many chemistry calculations. Small reference differences can affect final decimals.
Why Percentage Composition Matters
Percentage composition shows each element's mass share. Iron contributes about 69.94 percent by mass. Oxygen contributes about 30.06 percent.
These percentages support laboratory mixture calculations. They also help with stoichiometry exercises. Composition values describe pure Fe₂O₃ samples.
Actual industrial materials may contain impurities. Their measured percentages can therefore differ. Always use verified sample data when required.
Converting Between Mass and Moles
Moles connect particle counts with measurable laboratory mass. Multiply moles by molar mass for grams. Divide grams by molar mass for moles.
Millimoles are one thousandth of one mole. Milligrams are one thousandth of one gram. Kilograms contain one thousand grams.
The calculator handles these unit relationships automatically. This reduces manual conversion errors. It also speeds repeated classroom calculations.
Formula Units and Avogadro's Constant
Fe₂O₃ is an ionic compound. Therefore formula units are preferred over molecules. One mole contains Avogadro's number of formula units.
Avogadro's constant is 6.02214076 × 10²³. Multiplying moles by this value gives formula units. Dividing formula units gives corresponding moles.
This relationship connects microscopic particles with practical quantities. It is fundamental in introductory chemistry. The calculator performs both directions instantly.
Useful Calculation Tips
Keep extra decimals during intermediate calculations. Round only after reaching your final result. This approach improves numerical accuracy.
Check units before entering any quantity. A gram value differs greatly from milligrams. Choosing correct units prevents scale mistakes.
Use consistent atomic masses across assignments. Some textbooks round oxygen to 16.00. Their answers may differ slightly.
For standard classroom work, 159.687 g/mol is appropriate. Your instructor may specify another convention. Follow required reference values when provided.
Where This Calculator Helps
This tool supports chemistry homework and laboratory preparation. It also helps teachers prepare examples. Students can verify hand calculations quickly.
Researchers may use it for quick estimates. Industrial users can check conversion logic. Formal work should follow approved laboratory procedures.
Export tools make results easier to document. CSV works well with spreadsheets. PDF provides a convenient static record.
The calculator combines core chemistry conversions in one place. It reduces repeated arithmetic during routine work. Clear breakdowns make results easier to review.
Frequently Asked Questions
1. What is the molar mass of Fe₂O₃?
The molar mass is approximately 159.687 g/mol using standard atomic masses.
2. How is Fe₂O₃ molar mass calculated?
Multiply iron's mass by two. Multiply oxygen's mass by three. Then add both contributions.
3. What percentage of Fe₂O₃ is iron?
Iron represents approximately 69.94 percent of pure Fe₂O₃ by mass.
4. What percentage of Fe₂O₃ is oxygen?
Oxygen represents approximately 30.06 percent of pure Fe₂O₃ by mass.
5. How do I convert Fe₂O₃ grams into moles?
Divide the mass in grams by 159.687 grams per mole.
6. Are Fe₂O₃ particles called molecules?
Formula units are generally preferred because Fe₂O₃ is an ionic compound.
7. Why can another calculator show a different result?
Different atomic mass rounding conventions can create small decimal differences.