The % yield of ammonia as a function as a function of time in the reaction
` N_(2) (g) + 3H_(2) (g) hArr 2 NH_(3) (g), Delta H lt 0 " at" (P,T_(1)) ` is given below

If this reaction is cnducted at `(P,T_(2)) " with " T_(2) gtT_(1))` the % yield of ammonia as a function of time is

Options

A.
B.
C.
D.

Answer

B

Explanation

`N_(2)(g) + 3 H_(2) (g) hArr 2 NH_(3) (g) , Delta Hlt 0`
Intially , with increases of temperature `(T_(2) gt T_(1))`, % yield increases . However , after the equilibrium is reached , if temperature is further increased , i.e, heat is supplied to the system , equilibrium will shift in the backward direction according to Le Chatelier's principle . Hence , % yield will decrease. These changes are represented in plot (b).