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Consider separate solutions of \( 0.500 M \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}(a q) 0.100 \) \( M \mathrm{Mg}_{3}\left(\mathrm{PO}_{4}\right)_{2}(a q), 0.250 \quad M \mathrm{KBr}(a q) \) and \( 0.125 M \) \( \mathrm{Na}_{3} \mathrm{PO}_{4}(a q) \) at \( 25^{\circ} \mathrm{C} \). Which statement is true about these solutions, assuming all salts to be strong electrolytes?
(A) They all have the same osmotic pressure.
(B) \( 0.100 M \mathrm{Mg}_{3}\left(\mathrm{PO}_{4}\right)(a q) \) has the highest osmotic pressure.
(C) \( 0.125 \mathrm{M} \mathrm{Na}_{3} \mathrm{PO}_{4}(a q) \) has the highest osmotic pressure.
(D) \( 0.500 \mathrm{MC}_{2} \mathrm{H}_{5} \mathrm{OH}(a q) \) has the highest osmotic pressure.
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