molality = moles of solute / kg solvent
moles of solute = ?
kg of solvent = 4.568 g x 1 kg/1000 g = 0.004568 kg
molality = moles/kg = 1.81
1.81 moles/kg = x moles / 0.004568 kg
x = 0.00827 moles of solute are in the solution
The fact that 1.025 g is used does not enter into the calculation unless you wanted to determine the molar mass of the compound).