Question

Question 12 1 pts Consider the process represented in the diagram. Which statement(s) is/are TRUE? Select all. O A His positive, AS is positive O AH is negative, AS is negative O AHis negative, AS is positive A His positive, AS is negative O AG is negative at all temperatures. AG is negative at high temperatures. O AG is negative at low temperatures. O AG is positive at all temperatures.

Answer 1

In the given process, molecules in the starting material are close together while in the product, they are, on average, far apart. Therefore this process requires an input of energy (heat) to give the molecules enough kinetic energy to allow them to overcome the intermolecular attractive forces. Hence AH is positive in this process. On the other hand, molecules within the substance are becoming less organized after the conversion which indicates an increase in entropy. Thus AS is positive in this process. Now AG = AH-TAS [where AG = free energy change of a reaction, T = temperature] Since both AH and AS are positive thus AG will be negative only when value of T will be high. Therefore the correct answers are AH is positive, AS is positive AG is negative at high temperatures.