\textbf{104-} Gas-phase reaction: $K = 25$, $2M + 2Z \rightleftharpoons 4X + Y$, using moles of reactants equal to moles of products, the reaction is carried out in a closed container. If $0.2$ mol of gas X and $0.8$ mol of gas Y are at equilibrium, the volume of the container is how many milliliters?
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(1) $250$ \hspace{1cm} (2) $125$ \hspace{1cm} (3) $1250$ \hspace{1cm} (4) $2500$
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