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Two moles of ammonia is introduced in a ...

Two moles of ammonia is introduced in a evacuated 500 mL vessel at high temperature. This decomposition reaction is? `2NH_3(g)⇌N_2(g)+3H_2(g) At the equilibrium `NH_3` ​ becomes 1 mole then the K c ​ would be:
0.42
6.75
1.7
1.5

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