For the first question:The double directional arrow (<span>→←) shows that the equation is moving at both directions (forward and reverse) simultaneously (at the same time).
So for the equation, two processes are happening at the same time:
1- Carbon monoxide combines with oxygen to form carbon dioxide
2CO2 + O2 ..........> 2CO2
2- Carbon dioxide dissociates to give carbon monoxide and oxygen
2CO + O2 <........ 2CO2
For the second question:The equilibrium constant can be calculated as shown in the attached picture.
Applying this rule to the given equation, we find that:
k= [(0.01^1)(0.01^1)] / [(0.8^2)] = 1.5625 x 10^-4</span>