chemistry - Kelsey, Thursday, March 15, 2012 at 1:16am
My answer is:
Sorry I forgot to convert to J
also I checked this problem and I only got thedeltaS(surr)=466.4 J/mol*K correct. Please help
also I checked this problem and I only got the deltaS(surr)=466.4 J/mol*K correct. Please help
I have dS for system =
216.4 - 5.74 -2(223.0) = ? J/mol = -235.3 J/mol Check that.
dS for surroundings = -dH/T = -(-139,000)/298 = 466.4 J/mol
dS total (universe) = dS sys + dS surr = -235.3J + 466.4 = ? check that.
Check the signs. Check the # s.f.
Everything is right except the system...i put -253.5 and it marked me wrong :(
I think u added wrong on accident
Wait never mind thats what i got as the answer....so why is it wrong?
The best advice I have is for you to verify those numbers from your text/notes. I took these from a text that is almost 20 years old; newer numbers may be in your text. That's what meant with my first post; I gave you the numbers I had and I hoped you would check them with your reference.
I am puzzled too. If the dS univ is ok and the dS surroundings is ok, how can the dS system be out of whack since dS univ = dS sys + dS surr
the answer is -235.5...you subtracted wrong! Thanks for the help :)
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