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The RMS velocity of methylmethane at \( 27^{\circ} \mathrm{C} \) and
\( \mathrm{P} \) \( 720 \mathrm{~mm} \) of \( \mathrm{Hg} \) pressure is:

W
(1) \( 4.99 \times 10^{4} \mathrm{~cm} \mathrm{~s}^{-1} \)
(2) \( 3.99 \times 10^{4} \mathrm{~cm} \mathrm{~s}^{-1} \)
(3) \( 2.99 \times 10^{4} \mathrm{~cm} \mathrm{~s}^{-1} \)
(4) \( 1.99 \times 10^{4} \mathrm{~cm} \mathrm{~s}^{-1} \)
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