# What is the molar mass of Fe_2O_3?

Jun 14, 2016

The molar mass of $F {e}_{2} {O}_{3}$ is $159.70 \frac{g}{m o l}$

#### 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 $55.85 \frac{g}{m o l} \times 2 = 111.70 \frac{g}{m o l}$

We do the same for oxygen. There are 3 atoms of oxygen, so we multiply its molar mass by 3 to obtain $16.00 \frac{g}{m o l} \times 3 = 48.00 \frac{g}{m o l}$

Next we just add the final masses of each element together:
$48.00 \frac{g}{m o l}$ $+ 111.70 \frac{g}{m o l}$ $= 159.70 \frac{g}{m o l}$