The decomposition of ammonia is: 2NH3(g) ⇌ N2(g) + 3H2(g). If the pressure of ammonia is 1.0 × 10⁻3 atm, and the pressures of N2 and H2 are each 0.20 atm, what is the value for Kp at 400°C?
a) 1.5 × 10⁻7
b) 3.6 × 10⁻5
c) 2.4 × 10⁻3
d) 6.7 × 10⁻2