The unit of length convenient on the atomic scale is known as an angstrom and is denoted by $A\overset{0}{\mathop{{}}},$. 1$A\overset{0}{\mathop{{}}},$ = ${{10}^{-10}}$ m. The size of the hydrogen atom is about 0.5 $A\overset{0}{\mathop{{}}},$ . What is the total atomic volume in ${{m}^{3}}$ of a mole of hydrogen atoms ?
