What is the equilibrium pressure of O2(g) over M(s) at 298K? (atm)

For 1.) I got 10.6 kJ/mol and this is correct

For 2.) I got K= -4.28 and it marked me wrong. Now I got an answer of .01387. Is this correct???

For 3.) I got PO2= 0.0016 atm and it marked me wrong…I don’t know how it is wrong.