Question

Which of the following is true about
enthalpy of solution containing benzene
and toluene?
OPTIONS
Mark for Review
POINT(S): 1
A
. <0
soln
BO
AH soin = 0
AH soln
С C
>O
ΔΗ,
D
soin may be zero or greater
than zero​

Answer 1

Answer:

For a solution containing benzene and toluene, the change in enthalpy on mixing is zero (ΔH(solution) = 0).

Explanation:

Benzene and toluene when mixed in any proportion form a nearly ideal solution.

Each component belonging to an ideal solution and the solution itself obeys Raoult's law.

To form an ideal solution,

• The components must possess identical intermolecular forces.

• They must be similar in structure and polarity.

A perfect ideal solution is rare, but solutions can exhibit nearly ideal behaviour.

When the components forming an ideal solution are mixed, heat is neither evolved nor absorbed. This is because the nature of molecular interaction does not change significantly. Thus, there is no change in enthalpy of mixing the components of an ideal solution.

ΔH(mixing) = 0

Answer 2

Answer:

The correct option is B. ΔH solution = 0

Explanation:

• Ideal solutions are those solutions that follow Raoult's Law in all concentration ranges and temperatures.
• We may create ideal solutions by combining two components, a solute and a solvent with identical molecular size and structure.
• Only when the intermolecular forces of attraction between the solute and solvent are nearly equal, the solution is considered to be ideal.
• Some of the characteristics of an ideal solution are as follows:-

1. When two components are mixed, their enthalpy should be zero, or Δmix H = 0. This means that when two pure components are mixed to create a perfect solution, neither heat is emitted nor absorbed.
2. The mixing's volume is equal to zero, or Δmix V = 0. This indicates that the volume of the solution as a whole is precisely equal to the volume of the solute. Additionally, it denotes that the volume will change when the two components are mixed, either contracting or expanding.
3. The solute-solvent interaction is very similar to the solute-solute and solvent-solvent interactions.

• Benzene and toluene when mixed together form an ideal solution.

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