Homework Help: Chemistry

Posted by Ling on Thursday, December 13, 2012 at 3:09am.

Consider the gold-platinum system which has a value of delta w of -4250 J/mole;

(a) Calculate the enthalpy of mixing for a solution of 10% platinum and 90% gold. Express your answer in units of kJ/mole.

(b) Is the dissolution of 10% platinum into gold an endothermic or an exothermic process?
i)Exothermic as the change in enthalpy is negative.
ii)Endothermic as the change in enthalpy is positive.
iii)Impossible to tell without considering the entropy of the system.

Chemistry - Odesa, Thursday, December 13, 2012 at 3:09am
b) i
Chemistry - Anonymous, Thursday, December 13, 2012 at 8:46am
pls someone a) ?????????
Chemistry - Anonymous, Thursday, December 13, 2012 at 4:19pm
-2.295 for a)
Chemistry - Ling, Friday, December 14, 2012 at 12:58am
Thank you
Chemistry - XXX, Sunday, December 16, 2012 at 10:18am
Please discuss how you arrived at that -2.295 figure rather than directly give that answer. If all of you just wanted that f.uc.k.ing certificate without understanding the material, then what you will get is only certificate not the knowledge and experience...
Chemistry - edX, Sunday, December 16, 2012 at 8:50pm
Please mind your own answers--and business.
Chemistry - Anon, Monday, April 29, 2013 at 9:26pm
He has got a point, though he did it a bit too aggressively. What he wants to know is, what are the formulas for working out these two questions? After all, a similar question could pop up in the final exam! To tell you the truth, i kinda miss how it was at the beginning of the course, with people taking to the forums and asking for help with the formulas, and pointing out any mistakes in other people's posted formulas. people wrote the most beautiful things then. *Sigh* These days, it's just "The Answer is X" on sites like these.

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