E Courses-Blackboard Le x / A ALES-Corinne Venter . -C ENTROPY AND FREE ENERGY C
ID: 579268 • Letter: E
Question
E Courses-Blackboard Le x / A ALES-Corinne Venter . -C ENTROPY AND FREE ENERGY Corinne Using the conditions of spontanelity to deduce the slgns of AH an... Use the observations about each chemical reaction in the table below to decide the sign (positive or negative) of the reaction enthalpy AH and reaction entropy AS. Note: if you have not been given enough information to decide a sign, select the "unknown" option. reaction conclusions This roaction is always spontanoous, butH Is (plck one) proceeds s ower Lernperatures below -17.C. one) one) This reaction is spontaneous exuept 68. °C belAH iS as is I (pick one) . H is | (pick one) Crystallization of a purc compound is sptns anly elaw52. C Check LEKS-Cerinne Ve.. 2/7/2018Explanation / Answer
We know delta G = delta H - T x delta S
the condition for spontaneity is delta G is negative.
A) The reaction is always spontaneous, means delta G is always negative which implies that deltaH is negative and delta S is positive.
Thus for thisreaction delta H is negative , exothermic , but proceeds slow at very low temperatures means , the initiation is less at very low temperatures.
B)The reaction is spontaneous except below 68C.
That is at low temperatures it is non-spontaneous and at high temperature spontaneous,
Thus the reaction is endothermic, delta H is positivie and delta S is also positive.
At high temperatures delta H - T delta S is negative
C) Crystallization is psontaneous only below 52C.
That is delta H is negative and delta S is also negative ( physical state changing from liquid to solid)
Thus the delta G is negative only when the temperature is less.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.