Chemistry Acids and Bases help!?

1) What is the value for the equilibrium constant (Kp) for this reaction: 2NO(g) <---> N2O2(g) Given the equilibrium concentrations 0.224 M NO and 3.20 M N202 are present in a sealed reaction vessel at 25°C

a. 14.3
b. 44.1
c. 30.7
d. 63.7
e. 2.57

Please show your working!!
1 answer 1