A gas syringe holds a constant mass of air. The air has a volume of $240\,\text{cm}^3$ and a pressure of $5.0 \times 10^4\,\text{Pa}$. The air is then compressed slowly while the temperature is kept unchanged, until the pressure becomes $1.5 \times 10^5\,\text{Pa}$. What is the air’s final volume?
- A$72\,\text{cm}^3$
- B$80\,\text{cm}^3$
- C$720\,\text{cm}^3$
- D$800\,\text{cm}^3$