Question

Suppose that the hexagonal molecule C6HnF6-n has a residual entropy on account of the similarity of...

Suppose that the hexagonal molecule C6HnF6-n has a residual entropy on account of the similarity of the H and F atoms. Calculate the residual for each value of n.

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Answer #1

The residual entropy is given by the equation,S=Kb lnW where Kb is Boltzman constant,W is the number of possible orientation of the molecule.here,the given molecule is hexagonal and the number of possible orientation will be 6.Thus,

W will be 6 to the powe of N

S=Kb x ln 6 tothe power of N,where N is avogadro number(there will be avogadro no. of molecules in one mole)

ie,S=Kbx N ln6

=R ln 6 because KbxN is R,the universal gas constant.

=8.314J/k x 1.7917=14.894J/K mol

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