Be sure to answer all parts. From the values of AH and AS, predict which ofthe f

Question

Be sure to answer all parts. From the values of AH and AS, predict which ofthe following reactions would be spontaneous at 23°C: reaction A: AH-10.5 kJ/mol, AS 30.0 JIK mol O spontaneous o nonspontaneous O impossible to tell reaction B: AH-1.8 kJ/mol, 113 J/K mol, O spontaneous O nonspontaneous impossible to tell Ifeither of the reactions is nonspontaneous, can it(they) become spontaneous O yes, reaction A can become spontaneous yes, reaction B can become spontaneous yes, both reactions can become spontaneous no, neither reaction can become spontaneous If either of the reactions is nonspontaneous but can become spontaneous, at what temperature might it become spontaneous?

Explanation / Answer

As you have correctly pointed out, reaction A can become spontaneous

Lets see reaction A:

H = 10.5 KJ/mol = 10500 J/mol

S = 30.0 J/K.mol

for reaction to get spontaneous, G must become negative going through 0

So, lets calculate the temperature when it becomes 0

Use:

G = H - T*S

0 = 10500 - T*30.0

T = 350 K

Answer: 350 K

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