Which of the following will exhibit the greatest vapor pressure lowering?

Which of the following will exhibit the greatest vapor pressure lowering?

Step 1: Understand what vapor pressure lowering means. It occurs when a solute is added to a solvent, reducing the solvent's vapor pressure.
Step 2: Know that ionic compounds dissociate into ions when dissolved in water. The more ions produced, the greater the effect on vapor pressure.
Step 3: Look at the options given. Identify which compounds are ionic and how many ions they produce when dissolved.
Step 4: For CaCl2, it dissociates into 3 ions: 1 Ca2+ ion and 2 Cl- ions.
Step 5: Compare the number of ions produced by other options. The one with the most ions will have the greatest vapor pressure lowering.
Step 6: Conclude that since CaCl2 produces the most ions, it will exhibit the greatest vapor pressure lowering.

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