Chemistry

Problem

In a laboratory experiment, the root-mean-square speed of molecules in an unknown monatomic ideal gas is measured to be

540\,\text{m\,s}^{-1}

310\,\text{K}

. What is the molar mass of the gas? (Use

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

.) a)

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

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

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

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