An amount of 4 moles of \( \mathrm{NH}_{3} \) gas is introduced with a previously evacuated \( 1...

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An amount of 4 moles of \( \mathrm{NH}_{3} \) gas is introduced with a previously evacuated \( 1 \mathrm{~L} \) container in which it is partially dissociated at high temperature as \( 2 \mathrm{NH}_{3}(\mathrm{~g}) \rightleftharpoons \mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \)

At equilibrium, 2 mole of \( \mathrm{NH}_{3}(\mathrm{~g}) \) remained. The value of \( K_{C} \) for the reaction is
(a) \( 1.5 \mathrm{M}^{2} \)
(b) \( 6.75 M^{2} \)
(c) \( 0.44 M^{-2} \)
(d) \( 2.25 M^{2} \)
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