[L4R4]

Hey,
I was just wondering if you could help me out with this one?
I am given the standard molar free energies of the reactants and the products (both of which are gases) and then I am asked to work out the Kp of the reaction, and I am given the temperature at which the reaction occurs.
How do I work this out? I have pretty much read my whole textbook but i have no idea how to work out the answer to all of the practise problems regarding these types of questions...
 

[opti384]

Shouldn't you first find out the overall standard free energy of the reaction? And then think about this equation:   

K =e^-:delta:G/RT