[单选题]
A vessel of volume $1.0\times10^{-3}\,m^3$ contains neon gas at a pressure of $2.0\times10^5Pa$, when the temperature is 200 $K$. The molar gas constant is approximately $8.0\,J\,mol^{-1}K^{-1}$ and the molar mass of neon is $20\,g\,mol^{-1}$
What is the approximate mass of the neon in the vessel?
