G, (H20 (I)) --237.2 kl mol-1 (A)-818.0 (B) +818.0 (C) -580.8 (D) +580.8 E) not
ID: 592605 • Letter: G
Question
G, (H20 (I)) --237.2 kl mol-1 (A)-818.0 (B) +818.0 (C) -580.8 (D) +580.8 E) not enough information given 8. Using the following data, calculate the boiling point of ethanol. ,ap S® (C2H50H (I)) S" (C2HsOH (g)) 38.56 kJ mol-1 160.73 K-1 mol-1 270.4 J K-1 mol-1 = (A) 78.4°C (B) 0.4°C (C) 351.5°C (D) 109.7 (E) -78.4°C 9. For the reaction NH4NO3 (s) NH4+ (aq) + NO3-(aq) at 25°C, which one of the following statements is false: (A) (B) (C) (D) Go assumes the initial cation and anion concentrations are both 1 M. G is independent of the initial cation and anion concentrations. G = 0 corresponds to chemical equilibrium. > 0 means the reaction will proceed spontaneously to the left to establish equilib- rium (E) G"is temperature dependent.Explanation / Answer
As at the boiling point, vapour phase is in equilibrium with liquid phase
DG = 0
DH =T x DS
T = 38560/ (270.4 - 160.7) = 351.5 K
T boiling point = 351.5 - 273.15 = 78.35 C
The answer is A
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