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![[Post New]](/templates/default/images/icon_minipost_new.gif) 25 Mar 2008 22:28:52 IST
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@ low pressure , Vander waal's =n is given by PV = RT
the =n u wrote is V W =n @ moderate temp.
the fact for that is at moderate temp. , V decreases.....so a/V2 increases . But V is still large in comparison with b dat b can be neglected
so the =n becomes
(P +a/V2).(V - 0) = RT
or PV + a/V = RT
PV/RT = 1 - (a/RTV)
or Z = 1 - (a/RTV)
dats ur answer no. 3
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