Question

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

Answer 1

Answer:

spontaneous at temperatures greater than 800 K.

Explanation:

From the thermodynamic equation ,

ΔG = ΔH - TΔS

For spontaneous reaction ΔG = - ve

ΔH - TΔS < 0

TΔS > ΔH

T > ΔH / ΔS

> 40000 / 50

> 800 K

At temperature greater than 800K , reaction will be spontaneous.