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i have a problem in chemistry. how do i form compound formulas when an element has variable valencies.
eg: aluminium has valency 2 and 3 how will i know which valency to use
2. can we write ethanol as c2h5oh or ch3cooh.please explain in as much detail and include other web resource

2007-11-19 00:16:03 · 1 answers · asked by Anonymous in Science & Mathematics Chemistry

1 answers

Aluminium is always 3.

Iron can be both 2 and 3, so both Fe(OH)2 and Fe(OH)3 can exist and you can't tell which valency to use without more information.

C2H5OH is the same as CH3CH2OH; ethanol, the second just gives you more structural information.

CH3COOH is somethig else (acetic acid, sometimes called ethanoic acid).

As a resource, I suggest your textbook. But when you get stuck on something this important at the outset, you may just have to ask someone (your teacher? Your classmates?)

[Advanced aside just for the experts: actually, "Fe(OH)3" is a simplified formula]

2007-11-19 01:21:54 · answer #1 · answered by Facts Matter 7 · 0 0

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