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April 16, 2014

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.

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