Question

What is the molar mass of `Fe_2O_3`?

Answer 1

The molar mass of `Fe_2O_3` is `159.70 g/(mol)`

Explanation:

To find the molar mass of a compound you would use the periodic table to find the molar mass of each element separately.

In our case, our two elements are iron and oxygen . Find the molar mass of Fe (55.85 g/mol) and O (16.00 g/mol). Next multiply the molar mass of each element by the number of atoms given in the chemical formula.

For example, there are 2 atoms of Fe (denoted by the subscript). So multiply its molar mass by 2 to obtain `55.85g/(mol) xx2 = 111.70g /(mol)`

We do the same for oxygen. There are 3 atoms of oxygen, so we multiply its molar mass by 3 to obtain `16.00g/(mol) xx3 = 48.00g /(mol)`

Next we just add the final masses of each element together:
`48.00g /(mol)` `+111.70g /(mol)` `= 159.70g /(mol)`