Dissolve 27.6 g of
Let's say you want to prepare 1 L of 0.200 mol/L
That means you want to add 0.200 mol of the solid to enough water to make 1 L.
The molar mass of
So, you would measure out
You would transfer this carefully to a 1 L volumetric flask and use about 500 mL of distilled water to dissolve the solid.
Then you would add enough more distilled water to make the volume up to the 1 L mark.