Two glass vessels M and N are joined by a closed valve. M contains helium at $20\,^{\circ}\text{C}$ with a pressure of $1 \times 10^5\,\text{Pa}$. N has been evacuated and has a volume three times that of M. In an experiment, the valve is opened and the temperature of the whole apparatus is increased to $100\,^{\circ}\text{C}$. What is the final pressure in the system?
- A$3.18 \times 10^4\,\text{Pa}$
- B$4.24 \times 10^4\,\text{Pa}$
- C$1.25 \times 10^5\,\text{Pa}$
- D$5.09 \times 10^5\,\text{Pa}$