given the following data at a certain temperature, calculate K for the reaction between one mole of dinitrogen oxide gas and oxygen gas to give dinitrogen tetraoxide

Question

2N2 + O2 TO GIVE 2N2 K=1.2X10-35
N2O4 TO GIVE 2NO2 K=4.6X10-3
1/2N2 + O2 TO GIVE NO2 K=4.1X10-9

Answer 1

Something must be wrong here. Nowhere in any of th equations do I see N2O.