Homework Help: Chemistry

Posted by Odesa on Tuesday, December 11, 2012 at 3:45am.

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 - JoeBob, Tuesday, December 11, 2012 at 10:19pm
b) i
Chemistry - Paul, Wednesday, December 12, 2012 at 12:49am
Any idea on (a)?
Chemistry - qwerty, Friday, December 14, 2012 at 2:29am
-2.295
Chemistry - XXX, Sunday, December 16, 2012 at 10:19am
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 - XXX, Sunday, December 16, 2012 at 10:27am
The formula and explanation are given in the lecture video S23V2, in this case what you need to be cautious is the Z, Pt and Au are FCC structure, hence you need to draw the unit cell and its surrounding unit cell to get the idea of the coordination number.

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