Answer:
[tex]\boxed{\text{667 000 mL}}[/tex]
Explanation:
[tex]\text{Molar concentration} = \dfrac{\text{moles}}{\text{litres}}\\\\c = \dfrac{n}{v}[/tex]
Data:
c = 0.450 mol·L⁻¹
n = 300 mol
Calculation:
[tex]\begin{array}{rcl}0.450 & = & \dfrac{300}{V}\\\\0.450V& = & 300\\\\V & = & \dfrac{300}{0.450}\\\\V & = & \text{667 L} =\textbf{667 000 mL}\end{array}\\\text{The volume of solution needed is }\boxed{\textbf{667 000 mL}}[/tex]