To calculate the mass of Helium, we look up in the periodic table the atomic mass. This is equal to 4.003 g/mol.
Now, we apply the following relation to doing the conversion:
[tex]\begin{gathered} gH_{}e=\text{Given moles He}\times\frac{AtomicMass,\text{gHe}}{1\text{mol He}} \\ gH_{}e=\text{0.448}\times\frac{4.003\text{gHe}}{1\text{mol He}}=1.793\text{gHe} \end{gathered}[/tex]The mass of a Helium sample that contains 0.448 moles of He is 1.793 g
