Asked by Odesa
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.
(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.
Answers
Answered by
JoeBob
b) i
Answered by
Paul
Any idea on (a)?
Answered by
qwerty
-2.295
Answered by
XXX
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.