# What is the molar mass of SO_3?

Jun 14, 2016

The molar mass of $S {O}_{3}$ is $80.07 \frac{g}{m o l}$.

#### 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 sulfur and oxygen . Find the molar mass of S (32.07 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.

Since there is only 1 sulfur atom, the molar mass can be taken directly from the periodic table $\left(32.07 \frac{g}{m o l}\right)$.

Since there are 3 atoms of oxygen, we have to 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:
$48.00 \frac{g}{m o l}$ $+ 32.07 \frac{g}{m o l}$ $= 80.07 \frac{g}{m o l}$