228. In the reaction of 6 moles of $\mathrm{NO}$ gas with 4 moles of $\mathrm{CO}$ gas in a closed 2-liter flask at a certain temperature, 42 g of nitrogen gas is present at equilibrium, $K = \mathrm{L.mol^{-1}}$ and the total number of moles of gas in the reaction flask, from right to left, is which of the following? $(N = 14\ \mathrm{g.mol^{-1}})$ (1) $f/Y\Delta \cdot Y$ (2) $\Lambda/\Delta \cdot Y$ (3) $f/Y\Delta \cdot 1/\Delta$ (4) $\Lambda/\Delta \cdot 1/\Delta$
\textbf{228.} In the reaction of 6 moles of $\mathrm{NO}$ gas with 4 moles of $\mathrm{CO}$ gas in a closed 2-liter flask at a certain temperature, 42 g of nitrogen gas is present at equilibrium, $K = \mathrm{L.mol^{-1}}$ and the total number of moles of gas in the reaction flask, from right to left, is which of the following? $(N = 14\ \mathrm{g.mol^{-1}})$
(1) $f/Y\Delta \cdot Y$ \quad (2) $\Lambda/\Delta \cdot Y$ \quad (3) $f/Y\Delta \cdot 1/\Delta$ \quad (4) $\Lambda/\Delta \cdot 1/\Delta$