Consider the equation below and determine which response describesthe thermodyna

Question

Consider the equation below and determine which response describesthe thermodynamic spontaneity of the reaction. NH4Br (s) -->NH3 (g) + HBr (g)    H= 188 kJ
A. The reaction is spontaneous at all temperatures. B. The reaction is spontaneous only at relatively hightemperatures. C. The reaction is spontaneous only at relatively lowtemperatures. D. The reaction is not spontaneous at any temperature. E. Cannot be determined from the information given. NH4Br (s) -->NH3 (g) + HBr (g)    H= 188 kJ
A. The reaction is spontaneous at all temperatures. B. The reaction is spontaneous only at relatively hightemperatures. C. The reaction is spontaneous only at relatively lowtemperatures. D. The reaction is not spontaneous at any temperature. E. Cannot be determined from the information given.

Explanation / Answer

Whether the reaction is spontaneous or not is depends on G(Gibbs free energy change) G = H - TS Even you know the H is in this question is endothermic (Positivevalue), but you will not know whether the reaction is spontaneousor not as you don't know the value of entropy. Thus, the answer is E. Cannot be determined from theinformation given.

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