Question

Calculate the mass percentage of potassium in K3PO4

Answer 1

1) determine molar mass of K₃PO₄

`=3(39.10)+30.97+4(16)\\=212.27\ g/mol`

2) determine total mass of potassium atoms in K₃PO₄

`=3(39.10)\\=117.3\ g`

4) divide by molar mass and multiply by 100

`=(117.30)/(212.27)` ×
`100`

= 55.25981062% (round as you wish)