What Does the Dots and Numbers Mean in this Chemical Formula?

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SUMMARY

The chemical formula "C10H17N3S • 2 HCl • H2O" represents a compound consisting of ten carbon atoms, seventeen hydrogen atoms, three nitrogen atoms, one sulfur atom, two hydrochloric acid (HCl) molecules, and one water (H2O) molecule. The dots indicate a mixture of different molecular species. The notation with numbers before letters signifies the quantity of each atom or molecule present in the compound.

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I don't get this:

"Its empirical formula is
C 10 H 17 N 3 S • 2 HCl • H 2 O"

What is with those dots? And the middle part has a number before a letter...
 
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Well, it means you have got a mixture of molecules.

C_{10}H_{17}N_3S with two molecules of HCl and a single molecule of H_2O
 

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