How does a Chemist use Algebra?

Using the 'Moles' equation as the simplest example.

moles = mass(g) / Mr

This can be algrebaically rearranged to

Mr = mass(g) / moles

or

mass(g) = moles X Mr

So there you go.!!!! That's a chemist using algebra. There are many more chemical equations

Here's a few

e.g.

PV = nRT

moles = [conc] X vol(mL)/1000

pH = -log(10)[H^(+)]