Question

How do you calculate molar mass of compounds?

Answer 1

All you need to do is to follow these 3 steps.

Explanation:

To find the molar mass of a compound:
1. Use the chemical formula to determine the number of each type of atom present in the compound.

1. Multiply the atomic weight (from the periodic table) of each element by the number of atoms of that element present in the compound.

2. Add it all together and put units of grams/mole after the number.

eg. Water

Chemical formula- H20 i.e. 2 hydogens and 1 oxygen atom.
Atomic weight of H- 1
Atomic weight of O- 16
Total number of H atoms in formula-2
Total number of O atoms in formula-1
Therefore the molar mass will be:
H 2 x 1= 2
O 1 x 16= 16
16+2= 18
And so the molar mass of water is 18 g/mol.
Hope this helps!

Source: http://www.occc.edu/kmbailey/chem1115tutorials/Stoichiometry_Molar_Mass.htm