Question

# The thermodynamic parameters for the mixing of benzene and naphthalene are:

A
ΔG is positive
B
ΔSsystem is positive
C
ΔSsurrounding is zero
D
ΔH is zero

Solution

## The correct options are B ΔSsystem is positive C ΔSsurrounding is zero D ΔH is zeroBenzene and naphthalene form ideal solution.  For an ideal solution, since A-A interactions and B-B interactions are equal hence ΔH, change in enthalpy is zero and no heat is absorbed or released. Entropy of the system increases due to mixing. Free energy is given by, ΔG=ΔH−TΔSsystem Since ΔH is zero, ΔSsystem is positive, so free energy is negative. Since ΔH is zero,  ∴ΔSsurrounding=ΔHT=0Co-Curriculars

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