In a container of constant volume at a particular temparature N_(2) and H_(2) are mixed in the molar ratio of 9:13. The following two equilibria are found o be coexisting in the container N_(2)(g)+3H_(2)(g)harr2NH_(3)(g) N_(2)(g)+2H_(2)(g)harr N_(2)H_(4)(g) The total equiibrium pressure is found to be 305 atm while partial pressure of NH_(3)(g) and H_(2)(g) are 0.5 atm and 1 atm respectivly. Calculate of equilibrium constants of the two reactions given above.

In a container of constant volume at a particular temparature N_(2) an

1.	In a container of constant volume at a particular temparature N_(2) and H_(2) are mixed in the molar ratio of 9:13. The following two equilibria are found o be coexisting in the container N_(2)(g)+3H_(2)(g)harr2NH_(3)(g) N_(2)(g)+2H_(2)(g)harr N_(2)H_(4)(g) The total equiibrium pressure is found to be 305 atm while partial pressure of NH_(3)(g) and H_(2)(g) are 0.5 atm and 1 atm respectivly. Calculate of equilibrium constants of the two reactions given above.
Answer» Solution :Let the initial PARTIAL pressure of `N_(2)` be `9P` and `13P` respectively Total pressure`=P_(N_(2))+P_(H_(2))+P_(NH_(3))+P_(N_(2)H_(4))=3.5` ATM `(9P-x-y)+(13P-3x-2y)+2x+y=3.5`atm .....(1) ` P_(NH_(3))=2x=0.5` atm .....(2) `P_(H_(2))=(13P-3x-2y)= 1` atm ....(3) from (1) `implies(9P-x-y)+1 ` atm `+0.5+y=3.5` `implies(9P-x)=2` atm so `9P=2.25` `P=0.25` atm from (3) equation `2y=1.5` `y=0.75` atm so `P_(N_(2))=9P-x-y=1.25` atm `P_(H_(2))=1` atm `P_(NH_(3))=0.5` atm `P_(N_(2)(H_(4))=0.75` atm So, `K+(P_(1))=(P_(NH_(3))^(2))/P_(H_(2)^(3).P_(N_(2)))=(0.5xx0.5)/(1xx1xx1xx1.25)=0.2atm^(-2)` `K_(P_(2)=P_(N_2H_(4))/P_(N_(2).P_(H_(2))^(2))=(0.75)/(1xx1xx1.25)=0.6 atm^(-2)`