A sample of argon (molar mass ) is held at

CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

A sample of argon (molar mass

40.0\,\text{g\,mol}^{-1}

) is held at

300\,\text{K}

. What is the approximate root-mean-square speed of an argon atom in the sample? (Use

R=8.31\,\text{J\,mol}^{-1}\text{K}^{-1}

.) (a)

3.5\times10^{2}\,\text{m\,s}^{-1}

(b)

6.1\times10^{2}\,\text{m\,s}^{-1}

(c)

8.6\times10^{2}\,\text{m\,s}^{-1}

(d)

4.3\times10^{2}\,\text{m\,s}^{-1}