Question

1.For the reaction

CH₄(g) + H₂O(g)3H₂(g) + CO(g)

H° = 206 kJ and S° = 215 J/K

G° for this reaction would be negative at temperatures (above, below)  K.

For the reaction

2.2Fe(s) + 3Cl₂(g)2FeCl₃(s)

H° = -799 kJ and S° = -440 J/K

G° would be negative at temperatures (above, below)  K.

4.Consider the reaction:

NH₄NO₃(aq)N₂O(g) + 2H₂O(l)

Using standard absolute entropies at 298K, calculate the entropy change for the system when 2.27 moles of NH₄NO₃(aq) react at standard conditions.
  S°_system =  J/K

5.Consider the reaction:

2CO(g) + 2NO(g)2CO₂(g) + N₂(g)

Using standard absolute entropies at 298K, calculate the entropy change for the system when 1.54 moles of CO(g) react at standard conditions.
     S°_system =  J/K

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Answer 1

1) We have AH = +206 kJ AS0 215 J/K = 0.215 kJ/K If AH is positive and ASo is positive, then AG will be negative only when TASo should be greater in magnitude than AH° TAS AH ДН° T AS® 206 kJ 0.215 K 958 K Hence, the reacti on is spontaneous above 958 K