Answer to Question #97874 in General Chemistry for Nicky

Question #97874
A hydrated compound contains 25.9% calcium, 20.8% sulphur,41.6% oxygen and the rest is water of crystalization. Determine the empirical formula and give its IUPAC name
1
Expert's answer
2019-11-04T07:18:04-0500

Let 100 gm of compound is taken

Then

Moles of Ca taken = 25.940=0.6475\frac{25.9}{40}=0.6475

Moles of S taken = 0.650.65

Moles of oxygen taken = \frac{}{} 41.616=2.6\frac{41.6}{16}=2.6

Moles of water = 11.718=0.65\frac{11.7}{18}=0.65

Dividing all term by 0.65 for getting simple whole no. Ratio

We get,

Ratio of Ca : S : O : H2OH_2O = 1 : 1 : 4 : 1

So the compound is

CaSO4H2OCaSO_4•H_2O

IUPAC name = Calcium sulfate


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