Formula Calculation

We have a compound that is 32.38% Na, 22.65% S, 44.99% O

Determine the empirical formula

First step: Change our 100% composition to 100 g

We get 32.38 g Na, 22.65g S, 44.99g O

Step two: convert each of these to moles

To figure out moles we will divide by the molar mass of each

Next we have to determine the ratios

How will we do this?

Now lets figure out the molecular formula- the actual number of each atom in a compound

An experimental compound with the empirical formula NCl_3, has a molar mass of 361.5 g/mol

What is the molecular formula?