posted by help .
you need to make .80 M solution of NiSO4 (aq). How many grams of NiSO4 * 6H2O should you put into a .50 L volumetric flask?
You want how many moles?
That is M x L = 0.80 x 0.500L = ?
Then grams = moles/molar mass. You want to use the molar mass of NiSO4.6H2O