the following reaction has a Kp = 109 at 25 degrees C

2NO(g) + Br2(g) reversible 2NOBr(g)

If the equilibrium partial pressure of Br2 is 0.0159 atm and equil pressure of NOBr is 0.0768 atm, calculate the partial pressure of NO at equlibrium.

What are the steps to follow for this problem?