Which of the following statements about ideal solutions are true?
I.Entropy effects are important for the formation of ideal solutions.
II.The heat of solution is zero.
III.The vapor pressure varies linearly with the composition.
IV.The forces between like kinds of molecules are (almost)equal to the forces between unlike kinds of molecules.
A)I,II,IV
B)I,III,IV
C)II,III,IV
D)I,II,III
E)I,II,III,IV

Question

Quizplus · Accepted Answer

Ideal solutions follow Raoult's law, where the vapor pressure of each component is directly proportional to its mole fraction, leading to a linear variation of total vapor pressure with composition (III). The formation of an ideal solution doesn't involve a change in enthalpy (ΔH = 0), meaning the heat of solution is zero (II). This is because the forces between unlike molecules are nearly the same as those between like molecules (IV), ensuring no net energy change when they mix. Entropy effects are indeed important (I) because the mixing of two or more substances increases the disorder of the system, driving the formation of the solution.

Which of the Following Statements About Ideal Solutions Are True