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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: oneplusz on March 15, 2019, 12:53:13 AM

Title: Free Energy Question
Post by: oneplusz on March 15, 2019, 12:53:13 AM

Question is here: https://dl2.pushbulletusercontent.com/6WD2GULVGTGqgOrvwfmp1WDnuGJyb0h4/image.png

 Answer is here: https://dl2.pushbulletusercontent.com/kGIpk2SV3Bvvk2kemU3fteh1y4gERxos/image.png

I get the answer, no problem.  Math makes sense.  Perhaps I don't like the way the question is worded, or maybe it can be worded better.  But my issue is that a lower temperature, let's say 1K, still gives a negative ΔG (since subtracting a small negative would make negligible impact on the ΔH which is a large negative).

Also, according to this chart: https://dl2.pushbulletusercontent.com/6qEBwcqc1n6gUNtDpnqJKPnaYKkNoB7a/image.png
 
this scenario (negative ΔH and negative ΔS) is spontaneous at low temperatures.

What am I missing??!  It's probably something obvious.

Help and thanks in advance!

Title: Re: Free Energy Question
Post by: oneplusz on March 15, 2019, 12:58:17 AM

Was ΔS supposed to be positive?  Even so, the answer would be the wrong sign.   :|