Determine the empirical formula of the hydrated salt.

(a) The solubility of a salt is the maximum mass of the salt that can dissolve in 100 g of water at a given temperature.

(b) Given that 1.5 g of the salt dissolves in 50 g of water.

Step 1: Formula for solubility $S$ (in g per 100 g water)

$$S = \frac{\text{mass of salt (g)}}{\text{mass of water (g)}} \times 100$$

Step 2: Substitute the values

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