For a particular reaction, Δ?=139.99 kJ and Δ?=298.7 J/K. Calculate Δ? for this reaction at 298 K. Δ?=   kJ What can be said about the spontaneity of the reaction at 298 K? The system is spontaneous in the reverse

Which statement is true of the internal energy of the system and its surroundings following a process in which ΔEsys = +65 kJ? Explain.a. The system and the surroundings both lose 65 kJ of energy.b. The system and the surroundings both gain 65 kJ of energy.c. The system loses 65 kJ of energy and the surroundings gain 65 kJ of energy.d. The system gains 65 kJ of energy and the surroundings lose 65 kJ of energy.

For a chemical reaction, ΔSrxn = –200 J/K, and ΔHrxn = –50 kJ at approximately 298 K. At what temperatures will the reaction be spontaneous, if ever?    The reaction is never spontaneous at any temperature.    The reaction is spontaneous at high temperatures.    The reaction is spontaneous at any temperature.     The reaction is spontaneous at low temperatures. (this is correct but why?)

For each of the following reactions indicate whether as written it will be spontaneous at all temperature only at high enough temperatures only at low temperatures not at any temperatures or if the given information is insufficient to draw a conclu

Consider the reaction shown to answer the following question. 2CO (g) + 2H2 (g) → CO2 (g) + CH4 (g) AH° = - and AS° = - Which statement below is true? O This reaction is spontaneous at relatively higher temperatures and non-spontaneous at lower temperatures. O There is not enough information to make an assessment. O This reaction is spontaneous at relatively lower temperatures and non-spontaneous at higher temperatures. O This reaction is spontaneous at all temperatures. O This reaction is non-spontaneous at all temperatures.

For a particular reaction at 128.0 °C, AG = 227.67 kJ, and AS = 644.41 J/K. Calculate AG for this reaction at -1.9 °C. AG =

Consider the two different systems, A and B, shown below.  If there are 3 particles with a total energy of 12 J, which system would have more entropy and why? Question 21 options:   System A has more entropy because it has greater separation between energy levels and hence more microstates than system B.   System B has more entropy because it has more than two microstates, whereas System A only has two microstates possible.   System A has more entropy because it has three microstates, whereas System B has less than three microstates possible.   System B has more entropy because it has more than three microstates, whereas System A only has three microstates possible.   System A has more entropy because it has more than one microstate, whereas System B only has one microstate possible.

Read the descriptions of physical or chemical changes in the table below. Then decide whether the change will be spontaneous, if you can. Change A gas condenses to a liquid, neither absorbing nor releasing heat. An exothermic chemical reaction between a solid and a liquid results in gaseous products. Two liquids mix, neither absorbing nor releasing heat. Is this change spontaneous? Yes. No. Can't decide with information given. ○ Yes. ○ No. Can't decide with information given. Yes. No. ○ Can't decide with information given.

Which of the following can NOT be deduced from the value of ArGº for a reaction? Select one: the total energy that is absorbed or released by the system during reaction. the value of the equilibrium constant, K, for the reaction. the amount of work that can be obtained from or is required for a reaction or process under standard conditions. the direction (forwards or reverse) of the spontaneous overall reaction.

Read the descriptions of physical or chemical changes in the table below. Then decide whether the change will be spontaneous, if you can. Change During an endothermic chemical reaction, four moles of gaseous reactants are turned into two moles of gaseous products. A solid precipitates from a solution, releasing heat as it does so. A solid absorbs heat and turns to a gas. Is this change spontaneous? Yes. O No. O Can't decide with information given. O Yes. O No. O Can't decide with information given. O Yes. O No. O Can't decide with information given.