In: Chemistry
For Ammonia synthesis reaction: 3H2(g)+N2(g)?2NH3, Under 673 K, 1000 kPa, the initial molar ratio of H2 and N2 is 3:1 and then this reaction reach equilibrium. The molar ratio of NH3 is 0.0385. Calculate (1) the standard equilibrium constant under this condition. (2) At 673 K, the total pressure of this system if the molar ratio of NH3 is 0.05.
(1) Keq = [NH3]^2/[N2][H2]^3
N2 + 3H2 -------------> 2NH3
initial 1 3 0
change -0.01925 -0.05775 0.03885
equilibrium (1-0.01925) (3-0.05775) 0.03885
Feed in the equation,
Keq = (0.03885)^2/(1-0.01925)(3-0.05775)^3
= 6.04 x 10^-5
(2) Total moles = 1 + 3 + 0.5 = 4.5
total presure of the system = 4.5 x 0.0821 x 673/22.4 = 11.1 atm
P(N2) =