samples of NH3(g) and O2(g) are placed in a rigid container. When the equilibrium below is established, the partial pressure of H2O(g) is 0.784 atm. What is the partial pressure of NO(g) when the system is at equilibrium? 4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(g)