Question

If the Gibbs free energy of the ΔG= Glc - Gg liquid-crystalline phase for an aqueous dispersion of DPCC and raffinose is 17.9 kcal/mol, which of the following values is nearest the Gibbs free energy of the associated gel phase?

A. 3.5 kcal/mol
B. 32.3 kcal/mol
C. 566.1 kcal/mol
D. 601.9 kcal/mol

Answer 1

The answer is A. 3.5 kcal/mol

Step-by-step explanation:

Δ
`G = Glc - Gg`

Gibb free energy for phase transition of raffinose is

Δ
`G =` Δ
`H - T`Δ
`S`

Δ
`G = (16.0kcal/mol) - [(3.15 * 102k) (5.05 * 10 - 3 kcal/k.mol)]`

Δ
`G = 16.0kcal/mol - 1.60kcal/mol`

Δ
`G = 14.4kcal/mol`

`Gg = Gl -`Δ
`G`

`Gl = 17.9kcal/mol`

Δ
`G = 14.4kcal/mol`

Substituting value

`Gg - Gl -`Δ
`G`

`Gg = 17.9kcal/mol - 14.4kcal/mol`

Therefore,

`Gg = 3.5kcal/mol`