Emprical formula & water of crystallisation

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6 Terms

1
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Empirical formula

Simplest whole number ratio of atoms in a molecule

2
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Working out empirical formula

1) calc moles

2) divide mols by smallest mols.

3) scale to whole number if u have to

3
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Empirical formula to find molecular mass

Mr will be given to you.

1) find empirical formula: HSO4

2) find rfm of empirical formula

3) Mr divided by rfm = 2

4) EF x2 = H2S2O8

4
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Water of crystallisation definition

Number of water molecules contained in an ionic substance/salt

5
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Using masses

CuSO4.XH20 = 3g

CuSO4=. =1.92g

Subtract= XH20= 1.08g

work out mols:

1.08/18 =0.06 5H20

6
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using Mr

FeSO4.XH2O = 278

FeSO4=. =151.9

Subtract= XH2O = 126.1

126.1/18 =7H2O