64. For each reaction, calculate AHxn, ASixn, and AGxn at 25 °C and state whether or not the reaction is spontaneous. If the reaction is not spontaneous, would a change in temperature make it spontaneous? If so, should the temperature be raised or lowered. from 25 °C? a. 2 CH4(g) → C2H6(g) + H2(g) b. 2 NH3(g) → N₂H4(g) + H2(g)

For a given reaction, dH = 32 kJ/mol and dS = 117 J/mol. At approximately what temperature would this reaction become spontaneous?

1.  Find DHrxn, DSrxn, and DGrxn, using the tables at the end of your textbook for the phase change of water from liquid to gas at 25.0°C.               H2O (l)   <--->  H2O (g)    2. Is this phase change spontaneous at 25.0°C?  Give the reason for your answer. 3.  Find the temperature at which this phase change becomes spontaneous.  Give in both K and ℃. 4.  Is this what you expect, and why?  (Is the answer to question #3 what you expect)

Consider the following reaction; A(g) + B(g) → c(s) + D(g); AH = 159.1 kJ; AG = 164.1kJ at 298 K %3D The reaction is spontaneous at relatively high temperatures only The reaction is spontaneous at all temperatures The reaction is nonspontaneous at all temperatures. The reaction is at equilibrium at 298 K The reaction is spontaneous at relatively low temperatures only