1. For the reaction A + B → C + D, ΔH° = +40 kJ and ΔS° = +50 J/K.  Therefore, the reaction under standard conditions is:   ΔΔG = ΔΔH- TΔΔS Group of answer choices A. spontaneous at temperatures less than 10 K. B. spontaneous at all temperatures. C. spontaneous at temperatures greater than 800 K. D. spontaneous only at temperatures between 10 K and 800 K. E. nonspontaneous at all temperatures.

Sodium carbonate can be made by heating sodium bicarbonate: 2NaHCO3(s) → Na₂CO3(s) + CO₂(g) + H₂O(g) Given that AH° = 128.9 kJ/mol and AG° = 33.1 kJ/mol at 25°C, above what minimum temperature will the reaction become spontaneous? A. 0.4 K B. 3.9 K C. 321 K D. 401 K E. 525 K

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12. Consider the oxidation of iron metal 4Fe +302g → 2FE2O3() , by determining the sign of Astotal, Show that the reaction of spontaneous Material Fe Fe2O3 87.4 O2 S° J/K.mol ΔΗ, K/mol 27.3 205.0 -824.2

13)The reaction 2NOBr(g) → 2NO(g) + Br₂(g) has AG° = 6.28 kJ. a. Calculate Q when [NOBr] = 0.15 M, [NO] = 0.096 M, and [Br₂] = 0.081 M. b. Calculate AG for the reaction at 150°C. c. Is this reaction spontaneous or non-spontaneous under these conditions? Scanned with CamScanner