A hydrated salt of iron sulphate weighing 2g, contains 0.9065g of water of crystallisation. Find the formula of the hydrated salt.

Explanation

To determine the formula of the hydrated salt of iron sulfate, we need to follow these steps:

### Step 1: Calculate the mass of the anhydrous salt
The total mass of the hydrated salt is given as 2g, and the mass of water of crystallization is 0.9065g. We can find the mass of the anhydrous salt (iron sulfate) by subtracting the mass of water from the total mass.

\[ \text{Mass of anhydrous salt} = \text{Total mass} - \text{Mass of water} \]
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