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Fugacity: It is derived from Latin, expressed as fleetness or escaping ...

Fugacity: It is derived from Latin, expressed as fleetness or escaping ...

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Acc<strong>or</strong>ding to Gibbs Duhem equation both slopes must have oppsite sign then only the<br />

data <strong>is</strong> cons<strong>is</strong>tent, otherw<strong>is</strong>e it <strong>is</strong> incons<strong>is</strong>tent.<br />

F<strong>or</strong> the data to be cons<strong>is</strong>tent it h<strong>as</strong> sat<strong>is</strong>fy the following condition.<br />

1. If one of ln curves h<strong>as</strong> maximum at certain concentration and the other curve<br />

2.<br />

should be minimum at same composition.<br />

If there <strong>is</strong> no maximum <strong>or</strong> minimum point both must have + ue <strong>or</strong> –ue on entire<br />

range.<br />

Co-ex<strong>is</strong>tence equation<br />

The general f<strong>or</strong>m of Gibbs duhem equation at constant temperature and pressure<br />

0 d x ---(1)<br />

<br />

i i M<br />

In terms of partial molar free energies<br />

0 d x ------(2)<br />

<br />

i i G<br />

dividing equation (2) by dx1

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