Non spontaneous to spontaneous process?






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205192823
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Joined: Wed Sep 18, 2019 12:19 am

Non spontaneous to spontaneous process?

Postby 205192823 » Sat Mar 14, 2020 6:16 pm

Can a non spontaneous process with a positive delta S become spontaneous if the temperature is increased (assuming that delta H and delta S are both independent of temperature)?

BritneyP- 2c
Posts: 101
Joined: Sat Sep 14, 2019 12:15 am

Re: Non spontaneous to spontaneous process?

Postby BritneyP- 2c » Sat Mar 14, 2020 6:18 pm

If the process has a high delta S and a high delta H, it can become spontaneous with a high temperature.

MinuChoi
Posts: 100
Joined: Wed Sep 18, 2019 12:15 am

Re: Non spontaneous to spontaneous process?

Postby MinuChoi » Sat Mar 14, 2020 6:23 pm

Given the above statements are true:
deltaG = deltaH - T*deltaS.
If deltaS > 0, then T*deltaS is positive. Increasing T means that T*deltaS becomes larger, but it is subtracted. So deltaG would be decreasing as T increases. If your deltaG is positive before you start increasing temperature, then there will be a higher temperature where deltaG will decrease past zero (become spontaneous).


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