Symbol | # Atoms | Name | Atomic # | Molar Mass | Total Mass |
---|---|---|---|---|---|

Fe | 2 | Iron | 26 | 55.845 | 111.69 |

O | 3 | Oxygen | 8 | 15.999 | 47.997 |

Total Mass | 159.687 |

159.687 grams/mol.

See also our theoretical yield calculator for chemical reactions (probably your next stop to finish the problem set).

Need to know the atomic mass of a Iron Oxide molecule? Our molar mass calculator uses the periodic table and the chemical formula to solve for the molar mass of a chemical compound based on the compound's empirical formula. The calculator takes the elemental composition of the compound and weighs the elements to get an empirical formula mass. Note that the calculator assumes a pure substance - if you're aware of dilution or impurities, make appropriate adjustments for the molarity of a given substance.

This project started with as a molar mass calculator for chemical reactions. You can use our calculator to solve for the theoretical yield of an experiment. We also have a percent yield calculator which can help you apply this to actual experiments. Use the mole ratio and empirical formula to understand the limits of the reactants.

Other terms: atomic mass of Iron Oxide, molar mass of Iron Oxide, molecular mass,

We take the formula you provide (NaCl - common table salt - in our default example) and unpack it into the component elements. Then we compare each atom against a table of the standard atomic weights for that element. We present the results in a table at the bottom of the molar mass calculator - it will show the count of atoms, the atomic weight of each element, and the molecular weight for the molecule. It solves for total mass of a molecular formula (average molecular weight).

From there we break the formula for Iron Oxide into parts - a Iron atom, a Oxygen atom, etc.

We don't have brackets implemented (yet), so you will need to unpack any bracketed expressions. They don't affect the weight anyhow.
Simply take each element and multiple it by the number of times the bracketed structure occurs. For example:
(C_{6}H_{5})_{3}PCCO => C18H15PCCO

Our molar mass calculator has this for a variety of other compounds: sodium chloride, carbon dioxide, sulfuric acid, glucose...

- Molar Mass of Water (H2O)
- Molar Mass of Ammonium Hydroxide (Al(OH)3)
- Molar Mass of Ammonium phosphate ((NH4)3PO4)
- Molar Mass of Bismuth subsalicylate (C7H5BiO4)
- Molar Mass of Calcium hydroxide (Ca(OH)2)
- Molar Mass of carborundum (SiC)
- Molar Mass of hydrochloric acid (HCl)
- Molar Mass of phosphoric acid (H3PO4)
- Molar Mass of ammonium chloride (NH4Cl)
- Molar Mass of baking powder (NaHCO3)
- Molar Mass of Sucrose (C12H22O11)
- Molar Mass of Isopropyl Alcohol ((CH3)2CHOH)
- Molar Mass of Carbon Monoxide (CO)
- Molar Mass of antimony chloride - 3 (SbCl3)
- Molar Mass of Chloroplatinic acid (H2PtCl6)
- Molar Mass of Lactic Acid (C3H6O3)
- Molar Mass of Mercury Sulfate (HgSO4)
- Molar Mass of Potassium bromate (KBrO3)
- Molar Mass of Potassium thiocyanate (KCNS)
- Molar Mass of Sodium chromate (Na2CrO4)
- Molar Mass of Sodium potassium tartrate (NaKC4H4O6)
- Molar Mass of Thiourea (CH4N2S)
- Molar Mass of Cinnabar (HgS)
- Molar Mass of Ammonia (NH3)
- Molar Mass of Ammonium bicarbonate (NH4HCO3)
- Molar Mass of Acetone ( (CH₃)₂CO)
- Molar Mass of Aluminum phosphate (AlPO4)
- Molar Mass of Tannic acid (C76H52O46)
- Molar Mass of Sodium citrate (AgC2H3O2)
- Molar Mass of Ammonium carbonate ((NH4)2CO3)
- Molar Mass of Potassium hypochlorite (KClO)
- Molar Mass of Sodium nitride (Na3N)
- Molar Mass of Tartaric acid (C4H6O6)
- Molar Mass of Silver tetrafluoroborate (AgBF4)
- Molar Mass of silver fulminate (AgCNO)
- Molar Mass of gold chloride (AuCl)
- Molar Mass of gold triselenide (Au2Se3)
- Molar Mass of Dimethylcadmium (C2H6Cd)
- Molar Mass of Propan-1-ol (C3H8O)
- Molar Mass of Aluminium (Al)
- Molar Mass of Argon (Ar)
- Molar Mass of Lithium (Li)
- Molar Mass of Pentadecane (C15H32)
- Molar Mass of Triacontane (C30H62)
- Molar Mass of Cyclohexane (C6H12)
- Molar Mass of Methylamine (MeNH2)
- Molar Mass of Nitrogen Sulfur (NS)
- Molar Mass of Silicon monoxide (SiO)
- Molar Mass of Formaldehyde (H2CO)
- Molar Mass of Isothiocyanic acid (HNCS)
- Molar Mass of Cesium hydroxide (CsOH)
- Molar Mass of Fluoroboric acid (HBF4)
- Molar Mass of Durene (C10H14)
- Molar Mass of Picric acid ((O2N)3C6H2OH)

The tool is designed so you can flip between different parts of a problem set. **We recommend you bookmark it so you can refer back to it**.
You can also **share results with a study partner or tutor** by hitting calculate and copying the URL for this page. When your study partner
opens up the URL, they will see your calculations. It's easy share & save results via email. (Be sure to hit calculate first, however)

You also have the option of saving links to the calculations in your research notes files, so you can quickly re-open or check them later. Again - hit calculate first so the URL is updated with your most recent changes. Then copy and save the url.

Molar mass is an important concept in adapting chemical formulas to real world conditions. We may be able to balance a chemical equation and determine that one molecule of hydrogen combines with two of oxygen to make water (or the compound of your choice). But how would you set up the materials in the laboratory? Or if you were, for example, buying oxygen for a process, how would you determine how much to use to make a given quantity of water? Molar mass allows us to convert a chemical reaction into specific amounts of reagents required for the process. By converting the atomic interaction into grams, we can measure and use an appropriate amount of the necessary reagents. Formula mass helps us solve for this.

What Is Relative Atomic Mass / Relative Molecular Mass / Average Molecular Weight?

The relative atomic mass of a compound is the ratio of the average mass of the elements in a chemical compound to the atomic mass constant, which is defined as 1/12 the mass of a carbon 12 atom. For a single sample, the relative atomic mass of the sample is the weighted arithmetic mean of the masses of the individual atoms present in the sample (also known as the average atomic mass). This will vary by isotope of the element (carbon-12 vs. carbon-13, for example, since the two isotopes have a different atomic mass due to additional neutrons). In the real world, this can vary based on where the sample was collected - due to variances in the specific isotopes of the elements present (driven by differences in radioactive decay and how the material was aggregated to begin with).

Take a standard chemistry formula for a molecule, split it up into the component atoms, and look up the molar weight of each atom. Add the weight of the atoms in the molecule and you have the molar mass for the molecule.

Chemistry: Percent Yield Calculator Theoretical Yield Calculator, Molar Mass Calculator

Analysis: Interpolation Coefficient of Variation, Quadratic Formula

Algebra: GCD Calculator, LCM Calculator, Factorial Calculator, Factor An Integer, Perfect Numbers

Other: Weighted Grade Calculator, Weighted Average Calculator, Modulo Calculator, Arithmetic Sequence, Geometric Sequence, Fibonacci Sequence Z Score Calculator,

Content: theoretical yield calculator
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