What is the kinetic energy (in $J \ mol^{-1}$) of one mole of an ideal gas (molar mass $= 0.1 \ kg \ mol^{-1}$) if its rms velocity is $4 \times 10^2 \ ms^{-1}$ at $T(K)$?
- A$2 \times 10^5$
- B$8 \times 10^4$
- C$8 \times 10^2$
- D$8 \times 10^3$
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