766mL
The formula for calculating the molarity of a solution is expressed as:
[tex]\begin{gathered} molarity=\frac{moles}{volume} \\ \end{gathered}[/tex]Given the following parameters
moles of NaH = 1.67moles
molarity of solution = 2.18M
Substitute to determine the volume
[tex]\begin{gathered} volume=\frac{moles}{molarity} \\ volume=\frac{1.67}{2.18} \\ volume=0.766L=766mL \end{gathered}[/tex]Hence the volume of the solution in mL is 766mL