At 319K the decomposition of dinitrogen tetroxide occurs with the following Kp:

Question

2NO2(g)<>2NO(g)+O2(g) Kp=.700
What is the value of Kc for this reaction?

Answer 1

Kp = Kc(RT)^{n(prod)-n(react)}
Substitute and solve for Kc. I have estimated the answer at about 0.03. Post your work if you get stuck.

Answer 2

Kp = Kc (RT) (exponent = (2+1)-2)

0.700 = Kc (R * 319)

not sure what R is or how to figure it out????