When \( \mathrm{N}_{2} \mathrm{O}_{5} \) is heated at temp. \( \mathrm{T} \), it dissociates as ...
When \( \mathrm{N}_{2} \mathrm{O}_{5} \) is heated at temp. \( \mathrm{T} \), it dissociates as \( \mathrm{N}_{2} \mathrm{O}_{5} \rightleftharpoons \mathrm{N}_{2} \mathrm{O}_{3}+\mathrm{O}_{2}, \mathrm{~K}_{\mathrm{c}}=2.5 \). At the same time \( \mathrm{N}_{2} \mathrm{O}_{3} \) also decomposes as: \( \mathrm{N}_{2} \mathrm{O}_{3} \rightleftharpoons \mathrm{N}_{2} \mathrm{O}+\mathrm{O}_{2} \). If initially \( 4.0 \) moles of \( \mathrm{N}_{2} \mathrm{O}_{5} \) are taken in \( 1.0 \) litre flask
\( P \) and allowed to attain equilibrium, concentration of \( \mathrm{O}_{2} \) was formed to be \( 2.5 \mathrm{M} \). Equilibrium concentration of \( \mathrm{N}_{2} \mathrm{O} \) is
(A) \( 1.0 \)
(B) \( 1.5 \)
(C) \( 2.166 \)
(D) \( 0.334 \)
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