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Iron(III) oxide: Moles to Grams

Mass for iron(iii) oxide using 159.687 g/mol.

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For iron(iii) oxide (Fe2O3), the calculated molar mass is approximately 159.687 g/mol using CIAAW abridged standard atomic weights.

The atom-count table below shows the derivation. Standard atomic weights describe typical natural isotopic composition; their uncertainty means these are approximate molar masses, not exact constants.

The formula shown defines the compound and hydration state used. Check the reagent label: a hydrate, different chemical form, isotopic enrichment or impure sample needs a different calculation.

The formula

mass = amount in moles × molar mass
M
159.687 g/mol for Fe2O3
n
Amount of substance in moles
m
Mass in grams

How to use this calculator

  1. Confirm the chemical formula and hydration state.
  2. Enter the requested amount and, where relevant, final solution volume.
  3. Apply the stated formula. Retain only as many significant digits as your measurements and atomic weights justify.

Worked examples

One mole

One mole of Fe2O3 has a calculated mass of about 159.687 g. A mass of 159.687 g divided by 159.687 g/mol corresponds to 1 mol.

Frequently asked questions

Why might another table give a slightly different molar mass?

Atomic-weight tables use different editions or rounding. Natural isotopic composition also varies. Check the chemical formula, hydration state and precision before comparing.

Does this correct for purity or water absorbed during storage?

No. It assumes the stated pure chemical formula. Use the reagent specification and a suitable purity model when the actual composition differs.

Fe2O3: atom-by-atom molar mass

ElementAtom countAtomic weight usedContribution (g/mol)
Fe255.845111.69
O315.99947.997

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Molar Mass & Mole Conversions

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