Calculate the root-mean-square (rms) speed of He(g) molecules at 298 K

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

Problem

Calculate the root-mean-square (rms) speed of He(g) molecules at 298 K. (Use

R=8.314\,\text{J mol}^{-1}\text{K}^{-1}

and a molar mass of

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

.) (a)

1.11\times10^{3}\,\text{m s}^{-1}

(b)

1.89\times10^{3}\,\text{m s}^{-1}

(c)

1.36\times10^{3}\,\text{m s}^{-1}

(d)

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