Question

What mass of sulphur does 4.9 gram sample of Aluminium sulphate contain ?

Answer 1

Explanation:

A mole of Aluminium Sulphate contains 12 moles of Oxygen

So  

12

1

​

×0.24

Moles of Aluminium Sulphate contains 0.24 moles of Oxygen

So 2×10

−2

 Moles is the answer