Chlo.Harr
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In the evaporation of a solution MgSo4, when you know the moles of MgSO4, how do you work out the moles of magnesium in the magnesium sulfate?


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batoot
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FM of magnesium / FM of MgSO4: 24.3 / 72.4 = 0.335
0.335 x 100 = 33.5% of MgSO4 is magnesium


so 33.5% of the moles of MgSo4 = moles of Mg in MgSO4
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charco
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(Original post by batoot)
FM of magnesium / FM of MgSO4: 24.3 / 72.4 = 0.335
0.335 x 100 = 33.5% of MgSO4 is magnesium


so 33.5% of the moles of MgSo4 = moles of Mg in MgSO4
This is unfortunately incorrect.

You have 1 particle of magnesium per 1 formula unit of magnesium sulfate.

Hence, moles of magnesium = moles of magnesium sulfate
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Infraspecies
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You work out the ratio of the Mg in the MgSO4.

So, just an understanding of the stoichiometry of the compound, really.
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