Question

For the reaction N2O4 (g) 2NO2 (g), if percentage dissociation of N2O4 are 20%, 45%, 65% & 80%, then the sequence of observed vapour densities will be :

• A. d20> d45> d65> d80
• B. d80> d65> d45> d20
• C. d20 = d45 = d65 = d80
• D. (d20 = d45) > ( d65 = d80)

Answer 1

Answer: (A)

d20> d45> d65> d80

Answer 2

(VD)mix $\frac { M _ { \operatorname { mix } } } { 2 } = \frac { M } { 2 ( 1 + \alpha ) }$

so, as $\alpha$ increases (VD)mix decreases.