answer and explanation
in order to determine the number of moles for any compound, we need to know the Molar mass of that compound.
the molar mass of TiSO4 is 239.33g/mol and we use this in the following equation
moles = mass / Molar mass
= 2.38g / 239.99 g/mol
= 0.00992 moles
there are 0.00992 moles in 2.39 g of TiSO4