I think it would be 0.0025 kg
200 mg in g:
200 mg / 1000 => 0.2 g
number of moles Al(OH)3 :
molar mass = 78.00 g/mol
1 mole ---------- 78.00 g
? moles -------- 0.2 g
0.2 x 1 / 78.00 => <span> 0.00256 moles of Al(OH)3
number of moles Mg(OH)2 :
molar mass = 58.32 g/mol
1 mole --------- 58.32 g
? moles ------- 0.2 g
0.2 x 1 / 58.32 => </span><span>0.00343 moles of Mg(OH)2
hope this helps!</span>
The solute is the part of the solution that dissolves in the second component (usually a fluid). Therefore, for the mentioned solution, the solute is ehyl alcohol since it is the one dissolving in water.
As for the solvent, it is the component in which the solute dissolves. In this case, it is water.