Calculate the mass percent composition of lithium in Li3PO4 to four significant figures. Express your answer as a percent.

Li₃PO₄ has 18 % of Li

Explanation:

First of all we determine the molar mass of Lithium phosphate

Molar mass: 115.79 g / mol

1 mol of lithium phosphate has:

3 moles of Li → 20.82g

The mass percent composition of lithium will be:

(Mass of Li / Total mass). 100 → (20.82 g / 115.79 g). 100 = 18 %