Asked by Naomi

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.
Answered by DrBob222
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.
Answered by Please check again still have questions (Confused!!)
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??
Answered by Please check again still have questions (Confused!!)
OR would the mass of the dry material be 481.5 M since we are dealing with molarity.
Answered by DrBob222
You aren't dealing with molarity, you are dealing with molality.
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