An unknown monatomic noble gas has an rms speed of at 298 K

CHEMISTRY · Single correct · IB Diploma Programme · Chemistry · Introduction to the particulate nature of matter · Introduction to the particulate nature of matter

Problem

An unknown monatomic noble gas has an rms speed of 237 m s−1237\,\text{m s}^{-1} at 298 K. Using R=8.314 J mol−1K−1R=8.314\,\text{J mol}^{-1}\text{K}^{-1}, determine the approximate molar mass of the gas. (a) 84 g mol−184\,\text{g mol}^{-1} (b) 44 g mol−144\,\text{g mol}^{-1} (c) 131 g mol−1131\,\text{g mol}^{-1} (d) 112 g mol−1112\,\text{g mol}^{-1}

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