Question

What is the formula of potassium phosphate in grams/mole?

Answer 1

The formula of potassium phosphate is `K_3PO_4` .
Its relative formula mass is `212.2663 g mol^-1` .

Explanation:

The formula mass - which I believe is what you were looking for in the first place - can be found by adding up the relative molecular masses of each species in the formula unit.

`3(39.0983) + 30.9738 + 4(15.999) = 212.2663 g mol^-1`