Two glass vessels, M and N, are joined by a closed valve. M contains helium at $20^{\circ}\text{C}$ and a pressure of $1 \times 10^5\,\text{Pa}$. N has been evacuated, and its volume is three times that of M. The valve is opened, and the temperature of the entire 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$5.09 \times 10^5\,\text{Pa}$