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Multiple Choice
Which of the following compound will have the highest vapor pressure?
A
0.45 m dinitrogen pentoxide
B
0.10 m aluminum chloride
C
0.50 m iron (III) perchlorate
D
0.15 m calcium phosphate
E
0.30 m Potassium sulfide
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Verified step by step guidance
1
Understand that vapor pressure is influenced by the number of particles in solution. The more particles, the higher the vapor pressure.
Identify the compounds and their dissociation in water. For example, aluminum chloride (AlCl₃) dissociates into Al³⁺ and 3 Cl⁻ ions, resulting in 4 particles.
Calculate the total number of particles for each compound based on their molality and dissociation. For instance, iron (III) perchlorate (Fe(ClO₄)₃) dissociates into Fe³⁺ and 3 ClO₄⁻ ions, resulting in 4 particles.
Compare the number of particles for each compound: dinitrogen pentoxide (N₂O₅) does not dissociate, calcium phosphate (Ca₃(PO₄)₂) dissociates into 5 ions, and potassium sulfide (K₂S) dissociates into 3 ions.
Determine that the compound with the highest number of particles in solution will have the highest vapor pressure. Use this information to identify the compound with the highest vapor pressure.