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Consider separate solutions of 0.500M C 2 H 5 OH(aq), 0.100 M Mg 3 (PO 4 ) 2 (aq), 0.250M KBr(aq) and 0.125M Na 3 PO 4 (aq) at 25ºC. Which statement is true about these solutions, assuming all salts to be strong electrolytes ?

1. 0.100 M Mg 3 (PO 4 ) 2 (aq) has the highest osmotic pressure
2. 0.125 M Na 3 PO 4 (aq) has the highest osmotic pressure
3. 0.500 M C 2 H 5 OH(aq) has the highest osmotic pressure.
4. They all have the same osmotic pressure

Correct answer: They all have the same osmotic pressure

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