At 25 °C ,N 2 (g) + 3H 2 (g) = 2NH 3 (g) Δ r = -92.38kJ•mol -1 ,when the reaction is at equilibium in a closed rigid container which volume is always unchanged, how about the equilibium after adding a noble gas?
A.
Equilibrium shifts forward
B.
Equilibrium shifts reverse
C.
Equilibrium is not affected
D.
All are possible
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