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The degree of dissociation is 0.4 at 400...

The degree of dissociation is `0.4` at `400 K` and `1.0` atm for the gaseous reaction
`PCl_(5) hArr PCl_(3)+Cl_(2)`
assuming ideal behaviour of all gases, calculate the density of equilibrium mixture at `400 K` and `1.0` atm (relative atomic mass of P is `31.0` and of Cl is `35.5`).

Text Solution

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`{:("",PCI_5,hArr,PCI_3,+,CI_2),("Initial mole" ,1,"",0,"",0),("Mole at eqm",(1-0.4),"",0.4,"",0.4):}`
Total moe at eqm. =1-0.4 +0.4 +0.4 =1.4
`(m_(PCI_5)("normal"))/(m_(PCI_5)("observed"))=1+alpha=1.4`
`m_(PCI_5)("ovserved")=(208)/(1.4)`
PV=nRT ( at eqm)
`rArr PV=w/m Rt`
`rArr V/W =d =(Pm)/(RT)=(1xx208.5)/(1.4 xx0.0821xx400) =4.5 g//"litre"`
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