1.

Consider the following statements. If the van der Waals' parameters of two gases are given as a//dm^(6)bar "mol"^(-2)b//dm^(3)-"mol"^(-1) Gas A""6.5""0.056 Gas B""18.0""0.011 then 1. critical volume A gt critical volume of B 2. critical pressure of Agt critical presure of B 3. critical temperature of A gt critical temperature of B Which of the above statements is/are correct?

Answer»

<P>1 alone
1 and 2
1,2 and 3
2,and 3

Solution :Gas A:
`V_(C)=3b""3xx0.056=0.168dm^(3)"mol"^(-1)`
`P_(C)=a/(27b^(2))""6.5/(27xx(0.056)^(2))=76.8` ATM
`T_(c)=(8a)/(27Rb)""(8xx6.5)/(27xx0.0821xx0.056)=419.3K`
Gas B:
`V_(c)=3xx0.01=0.033dm^(3)"mol"^(-1)`
`P_(C)=18.0/(27xx(0.011)^(2))=5509.6`atm
`T_(C)=(8xx18)/(27xx0.0821xx0.011)=5905.6K`


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