Word Count : 261

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The root mean square speed (v_{\text{rms}}) of gas molecules is given by the equation: [ v_{\text{rms}} = \sqrt{\frac{3 k_B T}{m}} ] where (k_B) is the Boltzmann constant, (T) is the absolute temperature, and (m) is the mass of a single molecule. For helium, the molar mass (M) is 4 g/mol, so the mass of one helium atom is [ m_{\text{He}} = \frac{4 \times 10^{-3} \text{ __________ _____ _________ _________ ___ _________ ___ _____ ____ __________ ________.
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