First, find the number of moles it must contain.
[tex]c=\frac{n}{V}[/tex]
Where n is the number of moles, c = 0.5 and V = 600 mL. But, we need to use the volume in Liters, so we divide 600mL by 1000.
[tex]V=600mL\frac{1L}{1000mL}=0.6L[/tex]
Once we have the correct unit, find n.
[tex]n=0.5\cdot\frac{mol}{L}\cdot0.6L=0.3\text{moles}[/tex]
Now, we need to know what volume would contain 0.3 moles, using the same formula.
[tex]V=\frac{n}{c}[/tex]
Where n = 0.3 moles and c = 1.2 mol/L.
[tex]V=\frac{0.3\text{moles}}{1.2\cdot\frac{moles}{L}}=0.25L[/tex]
At last, transform 0.25 Liters into mL.
[tex]V=0.25L\cdot\frac{1000mL}{1L}=250mL[/tex]
Therefore, the volume is 250 mL.
