Question

What is the molar mass of `SO_3`?

Answer 1

The molar mass of `SO_3` is `80.07 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 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 `(32.07 (g)/(mol))`.

Since there are 3 atoms of oxygen, we have to 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)` `+32.07g /(mol)` `= 80.07g /(mol)`