\textbf{174.} In the figure, container A has a volume of 2 liters and contains oxygen gas at a temperature of $47\,^\circ\text{C}$ and a pressure of 4 atm, and container B has a volume of 5 liters and is completely empty. If we open the valve connecting the two containers and bring the temperature and pressure of the gas in the containers to 7 degrees Celsius, what will the pressure of the gas be in atm?
\textit{[Figure: Two containers A and B connected by a valve]}
\begin{itemize}
\item[(1)] $0.75$
\item[(2)] $1.25$
\item[(3)] $1$
\item[(4)] $2$
\end{itemize}
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