Multiple Choice
Which of the following solutes, when dissolved in equal molal amounts in water, will raise the boiling point of water the most?
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14. Solutions
Boiling Point Elevation
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Which of the following compounds has the lowest boiling point?
A
CH3OH
B
NaCl (aq)
C
CCl4
D
H2O
Verified step by step guidance1
Identify the types of intermolecular forces present in each compound, as boiling point is largely influenced by the strength of these forces.
For CH3OH (methanol), recognize that it exhibits hydrogen bonding due to the -OH group, along with dipole-dipole interactions and London dispersion forces.
For NaCl (aq), understand that it is an ionic compound dissolved in water, so the boiling point is influenced by ionic interactions and the properties of the aqueous solution.
For CCl4 (carbon tetrachloride), note that it is a nonpolar molecule, so its intermolecular forces are primarily London dispersion forces, which are generally weaker than hydrogen bonding or ionic interactions.
For H2O (water), recognize the strong hydrogen bonding between molecules, which leads to a relatively high boiling point compared to nonpolar molecules.
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