1.

The values of H and S for a reaction are respectively 30 kJ mol-1 and 100 kJ mol-1 . Then the temperature above which the reaction will become spontaneous is ……(a) 300 K (b) 30 K (c) 100 K (d) 20°C

Answer»

(a) 300 K 

∆G = ∆H – T∆S 

At 300 K.

∆G = 30000 J mol-1 – 300 J mol-1 x 100 J K mol-1

∆G = 0 

above 300 K; 

∆G will be negative and reaction becomes spontaneous.



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