The material Magnesium Sulfate What mass of dry material would be needed to make an aqueous solution with a molality of 4 moles/kg solution ? What mass of water is needed?

4 (24.305+ 32.065+ (4 x 15.999)) =481.5 ?Not sure where to go from here or if the problem is complete.

4 answers

Let me point out that your definition of molality is not right. The definition is m = #mols/kg SOLVENT and not kg SOLUTIION. So you have te mols calculated, place that is 1 kg solvent and you have it.
So just divide it. The mass of the dry material is 481.5 g or kg???? I'm sorry I'm still confused about this. The mass of the water is 1 kg right??
OR would the mass of the dry material be 481.5 M since we are dealing with molarity.
You aren't dealing with molarity, you are dealing with molality.
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