Consider the expression below, showing the terms which contribute to the heat of

Question

Consider the expression below, showing the terms which contribute to the heat of solution, Hsoln: Hsoln = Hsolute + Hsolvent + Hmix Which of the following sets correctly shows the signs (positive or negative) of the three terms on the right hand side of the equation? (My answer key says C! please explain why! Thank you!!)

A)

DHsolute > 0; DHsolvent > 0; DHmix > 0

D)

DHsolute < 0; DHsolvent < 0; DHmix > 0

B)

DHsolute < 0; DHsolvent < 0; DHmix < 0

E)

DHsolute < 0; DHsolvent > 0; DHmix < 0

C)

DHsolute > 0; DHsolvent > 0; DHmix < 0

A)

DHsolute > 0; DHsolvent > 0; DHmix > 0

D)

DHsolute < 0; DHsolvent < 0; DHmix > 0

B)

DHsolute < 0; DHsolvent < 0; DHmix < 0

E)

DHsolute < 0; DHsolvent > 0; DHmix < 0

C)

DHsolute > 0; DHsolvent > 0; DHmix < 0

Explanation / Answer

(C) To break the Solute - Solute interactions it requires energy, Delta Hsolute > 0

Similarly to break the Solvent - Solvent interactions, it requires energy, hence, Delta Hsolvent > 0

And the new Solute - solvent interactions will stabilise the mixture , thus releases energy, Hence Delta Hmixture < 0

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