Is the molecular formula for sugar correct?

[akerkarprashant]

TL;DR

Molecular formula correction.

Is the following molecular formula for Sugar can be written as
H22C12O11 or
O11C12H22 or
O11H22C12 or
C12O11H22 or
H22O11C12
instead of C12H22O11?

Logically they can be written as mentioned above?

If Not, Why?

There can be many more examples similar to above.

 

[akerkarprashant]

Thanks.

Another example could be for Sulphuric acid having molecular formula as H2SO4.

This can be SH2O4,O4H2S,H2O4S, SO4H2,O4SH2.

Thanks & Regards,
Prashant S Akerkar

 

[BvU]

Two totally different cases.

The molecular formula for saccharose is C₁₂H₂₂O₁₁ in that order -- by convention: Alphabetical. Doesn't tell you all you need to know to reconstruct the molecule. For that the IUPAC name (horrible ! See 3.1.1 here) is intended.

Sulfuric acid contains a functional group SO₄^2- and -- as an inorganic acid -- its name by convention starts with the hydrogen ions. Hence H₂SO₄

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[akerkarprashant]

Thanks.

Mostly the convention for Molecular formulas will be alphabetical based ?

Is there a good site which sets the rules for molecular formula naming conventions?

Thanks & Regards,
Prashant S Akerkar

 

[BvU]

Not really. You could try Googling 'Hill system' or 'Richter system formulas'. Or even simply 'Chemical formula'

And my 'alphabetical' appears to be too simple-minded. The Hill system has C, H and then alphabetical, the RIchter system is still quite relevant (e.g. for Beilstein !). See e.g. here

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[TeethWhitener]

Wait, so what about NH₃?

 

[Borek]

IUPAC colored books (never remember which one is which) are definitive source for conventions used. In some cases general convention says one thing, but common, well established names/formulas are allowed.

That's mostly for historical reasons, way too many names and conventions are well established, universally understood, but unsystematic.

 

[dextercioby]

Here is one uncalled for, unprofessional opinion.

We usually put cations to the left and anions to the right (NaCl, K₂S, etc.). This goes for covalent compounds, too, where we use oxidation numbers (SO₂, H₂S, etc). Exception ammonia, probably for historical reasons.