What is the molar mass of helium gas?

Step 1: Molar mass:

• The mass of 1 mole of a substance is called its molar mass.

Step 2: Formula for molar mass

• $\mathrm{Molar}\mathrm{mass}=\mathrm{The}\mathrm{atomic}\mathrm{mass}\mathrm{of}\mathrm{element}\times \mathrm{number}\mathrm{of}\mathrm{atoms}\mathrm{given}\mathrm{in}\mathrm{subscript}$

Step 3: Molar mass of Helium$\left(\mathrm{He}\right)$ gas:

• Helium is a non-toxic/non-combustible gas.
• The molar mass of Helium$\left(\mathrm{He}\right)$ gas is $4.00\mathrm{g}{\mathrm{mol}}^{-1}$.