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15240672380's Question
Chemistry
Posted 7 months ago

Which of the following has the highest boiling point?
0.75 mKNO30.75 mAlCl30.75 mMgCl20.75 mCaBr2
\begin{array}{l}
-0.75 \mathrm{~m} \mathrm{KNO}_{3} \\
-0.75 \mathrm{~m} \mathrm{AlCl}_{3} \\
-0.75 \mathrm{~m} \mathrm{MgCl}_{2} \\
-0.75 \mathrm{~m} \mathrm{CaBr}_{2}
\end{array}


Please explain the reasoning through Intermolecular Forces
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Answer from Sia
Posted 7 months ago
D
Key Concept
Colligative properties and van 't Hoff factor
Explanation
The boiling point elevation is a colligative property that depends on the number of particles in solution. The van 't Hoff factor (i) represents the number of particles a compound dissociates into in solution. AlCl3 dissociates into four particles (1 Al^3+ and 3 Cl^-), which is more than the other options, leading to the highest boiling point elevation.

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