$2$NO$2(8)7$ N$204($g$)$Kc $=20\mathrm{.}0$ at $55\backslash$deg CAt $55\backslash$deg C a flask contains $0\mathrm{.}040$ mol$-$L$-1$ NO$2($g$)$ and $0\mathrm{.}040$ mol$-$L$-\backslash$ N$204($g$).$ When equilibrium is reached,$($A$)$ some of the NO$2($g$)$ will have been converted to N$204(8).($B$)$some of the N$204($g$)$ will have been converted to NO$2($g$).($C$)$ the concentrations will remain at $0\mathrm{.}040$ mol$-$L$-1$ forN$02(8)$ and $0\mathrm{.}040$ mol$-$L$-1$ for N$204(8).($D$)$ all of the NO$2($g$)$ will have been converted to N$204($g$).$