A technician placed a 2.5 mol of NO(g) in an empty 2.0 L flask and allowed the contents to establish the following equilibrium. 

4NO(g)?2N2O(g)+O2(g)+197kJ

At equilibrium it was determined that there was 0.58 mol of N₂O(g) present. 

The percent yield of this reaction is Answer %

The equilibrium concentration of NO(g) is Answer mol/L