AP EAMCET Engineering 23 Apr 2019 Shift 1 Paper

The pressure of the gas N2O4 using an ideal gas equation is,
p=

nRT

V

Substitute the given value in above expression.
p=

18.4×0.083×400

1×92

=6.64 bar
At equilibrium condition, the pressure of N2O4 is p−pi and thepressure of NO2 is 2pi
The total pressure at an equilibrium condition is given as,
pT=p−pi+2pi
pT=p+pi
pi=10.64−6.64
=4‌bar
The value of equilibrium constant is,
Kp=

[pNo2]2

[pN2o4]

=

(2×4)2‌bar

(6.64−4)‌bar

=24.29