A chemical substance may consist of atoms of a single element or of different elements. The molar mass of an element is the mass per mole of its atoms. The molar mass of a compound is the mass per mole of its molecules. The molar mass of an ionic compound is mass per mole of its formula units.

 

To calculate the molar mass of a substance we add up the individual molar masses of the constituent atoms.

 

To use this calculator enter a chemical formula and tap OK, or alternatively, select a sample molecule from the menu. For example, if you needed the molar mass of sulfuric acid you would enter H2SO4.