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A) on a molecular scale, describe how a crystal of alum differs from a crystal of potassium aluminum sulfate.

B) when preforming stoichiometric calculations with alum, what do you need to do differently to calculate the number of moles of alum compared to potassium aluminum sulfate?

A on a molecular scale describe how a crystal of alum differs from a crystal of potassium aluminum sulfate B when preforming stoichiometric calculations with al class=

Respuesta :

barnuts

A. Since the alum has an additional 12H2O, therefore obviously it is a heavier compound.

The hydrated form (alum) has a molar mass of about 474.39, while the anhydrous form has a molar mass of 258.39 only.

I’m not quite sure but I believe that the alum has a monoclinic structure while the anhydrous form has a amorphous structure.

 

B.  In stoichiometric calculations, the main difference would be on the molar masses to be used in computing for moles from grams and vice versa.

Dejanras

A) Answer is: potassium aluminium sulfate is crystal with cubic structure, potassium aluminium sulfate dodecahydrate (alum) is hydrate (contains water or its constituent elements).

B) Answer is: molar mass.

M(KAl(SO₄)₂) = 258.192 g/mol; molar mass of anhydrous potassium aluminium sulfate.

M(KAl(SO₄)₂×12H₂O) = 474.37 g/mol; molar mass of potassium aluminium sulfate dodecahydrate.

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