Answer to Question #68692 in Physical Chemistry for zal

Question #68692

The dissociation of dinitrogen tetraoxide into nitrogen dioxide is represented by the equation
below.
N2O4(g) 2NO2(g); ∆Ho = +57kJ mol –1
If the temperature of an equilibrium mixture of the gases is increased at constant pressure, will
the volume of the mixture increase or decrease and why?
A The volume will increase, but only because of a shift of equilibrium towards the right.
B The volume will increase, both because of a shift of equilibrium towards the right and also
because of thermal expansion.
C The volume will stay the same, because any thermal expansion could be exactly
counteracted by a shift of equilibrium towards the left.
D The volume will decrease, because a shift of equilibrium towards the left would more than
counteract any thermal expansion.

Expert's answer

B. The volume will increase, both because of a shift of equilibrium towards the right and also because of thermal expansion.