MOLAR MASS CALCULATOR
Enter a chemical formula to calculate its molar mass (e.g. Fe4[Fe(CN)6]3, NaHCO3, ch3coonh4, h2so4, pb(c2h3o2)2*3h2o, caso4*1/2h2o) and press Enter or click Calculate button.
| Chemical Formula | Formula in Hill notation | Molar Mass (g/mol) |
|---|---|---|
| CH3COONH4 | C2H7NO2 | 77.08 |
The molar mass of a substance (M) is the weight of one mole of the substance. The SI unit for molar mass is kg/mol, though the decimal unit g/mol is more commonly used.
Amount:
Mass:
| Element name | Element symbol | Number of atoms | Relative atomic mass | Mass of the element (g) | Mass fraction (%) |
|---|---|---|---|---|---|
| Oxygen | O | 2 | 15.999 | 31.998 | 41.51 |
| Carbon | C | 2 | 12.01 | 24.02 | 31.16 |
| Nitrogen | N | 1 | 14.007 | 14.007 | 18.17 |
| Hydrogen | H | 7 | 1.008 | 7.056 | 9.15 |
| TOTAL: | 12 | 77.08 | 77.08 | 100 |
The relative atomic mass indicates how many times larger the mass of a given atom is than 1/12 the mass of the 12C carbon isotope. Relative atomic mass is a dimensionless number. An element generally consists of several isotopes of differing atomic mass. The relative atomic masses listed here represent average values of the naturally occurring isotopic mixture on the Earth and they are expressed with five significant figures.
The Hill system (or Hill notation) is a standard way of writing the formula for any chemical compound. With the Hill notation, the number of carbon atoms in a molecule is indicated first, the number of hydrogen atoms next, and then the number of all other chemical elements subsequently, in alphabetical order. When the formula contains no carbon, all the elements, including hydrogen, are listed alphabetically.
Bibliography:
- J. Meija et al., Atomic Weights of the Elements 2013. Pure Appl. Chem. 88, 265-291 (2016)
Citing this page:
Generalic, Eni. "Molar mass calculator." EniG. Periodic Table of the Elements. KTF-Split, 25 Nov. 2023. Web. {Date of access}. <https://www.periodni.com/molar_mass_calculator.php>.
