Up next in Intermediate Math Skills (21 videos)
Brush up on your math with these tutorials.
You Will Need
- A periodic table
- A chemical compound formula
- Molar masses of elements
Find molar mass of an element
Find the molar mass of an element. In grams, molar mass is numerically equal to the element's atomic weight in atomic mass units, which you can find on the periodic table of the elements.
Calculate diatomic elements
Remember that seven elements – hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, and iodine, are diatomic elements. As pure elements, they form molecules containing two atoms. To find the molar mass of a diatomic element, multiply its atomic weight by two.
Consider chemical compounds without subscripts
If you're working with a chemical compound – a combination of elements – whose formula does not contain any subscripts, add the molar masses of each of the elements.
Consider chemical compounds with subscripts
If your compound does contain subscripts, multiply the number of atoms of any element or chemical group with a subscript by the subscript value.
Consider chemical compounds with more complicated formulas
If you're working with a compound that has more complicated subscripts, take into account the total number of atoms present in the compound.
Use the calculation
Use molar mass in all kinds of chemistry calculations, including finding the molecular formula of a substance.