The molecular formula of ferric sulphate is `Fe_2(SO_4)_3`. (Atomic mass : Fe = 56, S = 32, O = 16)
(a) Calculate the molar mass of `Fe_2(So_4)_3`.
(b) How many moles of each element are there in 40 g of ferric sulphate?

Explanation

To solve the problem step by step, we will break it down into two parts: (a) calculating the molar mass of ferric sulphate, and (b) determining the number of moles of each element in 40 g of ferric sulphate.

### Part (a): Calculate the molar mass of `Fe_2(SO_4)_3`

1. **Identify the components of the molecular formula**:
- The formula `Fe_2(SO_4)_3` consists of:
- 2 Iron (Fe) atoms
- 3 Sulphate (SO₄) groups, which contain 3 Sulphur (S) atoms and 12 Oxygen (O) atoms.
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