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Section 5: Reaction Spontaneity

Reaction Spontaneity

1.
Which of the following processes occurs with a decrease in entropy?
A)freezing of water
B)boiling water
C)sublimation of dry ice
D)dissolving salt in water
2.
At one atmosphere pressure and the melting point of a substance, which statement is true about this general equation? solid 3 liquid
A)ΔH = 0 for the process
B)ΔS = 0 for the process
C)ΔG = 0 for the process
D)Both ΔH and ΔS = 0 for the process
3.
Calculate the ΔG° for the reaction:
2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(l)ΔG° (kJ/mol)209.2, 0, -394.4, -237.2
A)-1409 kJ
B)-2599 kJ
C)-1643 kJ
D)-2470 kJ
4.
A process can never be spontaneous when it is _________.
A)exothermic, and there is an increase in disorder
B)endothermic, and there is an increase in disorder
C)exothermic, and there is a decrease in disorder
D)endothermic, and there is a decrease in disorder
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