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2 moles of gas contained in a four litre...

2 moles of gas contained in a four litre flask exerts a pressure of Il atm at `27^@C`. If vander Waals parameter bis 0.05 l/mol, the value of 'a' (in atm `"lt"^(2) "mol"^(-2)`) is 

A

6.46

B

3.23

C

`2.0`

D

`1.23`

Text Solution

Verified by Experts

The correct Answer is:
A
`n = 2, V = 4, P = 11, T = 300 K , b = 0.05`
`(P + (an^2)/(V^2)) (V - nb) = nRT`
`(11 + (a xx 4)/(10)) (4 - 2 xx 0.05) = 2 xx 0.0821 xx 300`
`= 11 + a/4 = 12.6 implies a = 6.4`.
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