A quantity of gas is enclosed in a large syringe. The atmospheric pressure is $100\,\text{kPa}$. The gas pressure is $200\,\text{kPa}$ above atmospheric pressure. As the piston moves outwards, the volume of the enclosed gas doubles. The temperature stays constant. What is the new gas pressure?
- A$100\,\text{kPa}$
- B$150\,\text{kPa}$
- C$200\,\text{kPa}$
- D$400\,\text{kPa}$