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shift of equilibrium when the volume of container decreases

Question 4
For which of the following systems at equilibrium will shift to produce more products when the volume of the container is decreased?
i) H2(g) + I2(g) 2 HI(g)
ii) 2 NO2(g) N2O4(g)
iii) PCl5(g) PCl3(g) + Cl2(g)
iv) ZnO(s) + CO2(g ZnCO3(s)

a. ) none of them
b. ) i and ii
c. ) ii and iv
d. ) iii and iv
e. ) all of them

Solution Preview

The change of the volume of the contatiner effects the partial pressure of the gas in the container.
PV = nRT
so the decrease in volume indicates the increase of the partial pressure of the gas.
According to Le Chatelier's principle, the equilibrium shifts to partially counter-act the imposed change.

Let's take a look at ii) 2NO2 (g) --> N2O4
Because ...

Solution Summary

It explains how the systems of equilibrium shifts when the volume of the container decreased.