Q.

The vapour density of N2O4 at certain temperature is 30. What is the percentage dissociation of N2O4 at that temperature?

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a

53.3%

b

106.6%

c

26.7%

d

83.4%

answer is A.

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Detailed Solution

Degree of decomposition,D = V.D of undissociated speciesd = V.D of equilibrium mixture (observed vapour density)N2O4g ⇌2NO2g;  n = 2 ;D = 46 ;d = 30 α =46-30302-1 ; α =1630; α =0.5333Percentage dissociation of N2O4 = (0.5333 x 100)= 53.33%
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