(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The activity coefficient of zinc in liquid brass is given (in joules) by the following equation for

temperatures 1000-1500 K:

RT ln γZn = -38,300 x2Cu

where xCu is the mole fraction of copper. Calculate the partial pressure of pure zinc PZn over a

solution of 60 mol% copper and 40 mol % zinc at 1200 K. The vapor pressure of pure zinc is

1.17 atm at 1200 K.

2. Relevant equations

For dilute solutions: xs: mole fraction of solvent, xu: mole fraction of solute,

The vapour pressure of the solvent= Ps= P(pure)xs=P(pure)(1-xu) where is P(pure)=vapour pressure of the pure solvent.

Gibbs-Duhem Relationship=

lnaB

lnaA= - ∫ xB/ xa * d(lnaB)

-∞

3. The attempt at a solution

d (lnγA)= - XB/XA * d(lnγB) applying Gibbs-Duhem rel. in the form of this eqnn:

dxcu= -dXzn

lnγCu= - 38.300/ RT * X^2Zn

How can i get the partial pressure of pure zinc PZn?

Thanks! :)

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Calculating the partial pressure of pure Zinc over a solution? over

**Physics Forums | Science Articles, Homework Help, Discussion**