The diagram illustrates two cylinders joined by a slender tube that has a tap. In one cylinder, there is $80\,\text{cm}^3$ of gas at a pressure of $2.0 \times 10^5\,\text{Pa}$. The other cylinder is a vacuum. The evacuated cylinder has a volume of $20\,\text{cm}^3$. The tap is then opened, allowing the gas to spread out and occupy both cylinders. The gas temperature stays constant throughout. What is the final pressure of the gas?
- A$0.50 \times 10^5\,\text{Pa}$
- B$1.6 \times 10^5\,\text{Pa}$
- C$2.5 \times 10^5\,\text{Pa}$
- D$8.0 \times 10^5\,\text{Pa}$