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Chemical transformation (Decomposition)

by chemistry1
Tags: chemical, decomposition, transformation
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Feb1-14, 05:14 PM
P: 106
Hi, I was wondering when you need to write the decomposition of a substance, how do you know if the number is going to be a coefficient or subscript ?


2H2O ===>2H2 + 02 would be the answer

But why not

2H2O ==> 2H2 + 2O

Knowing that we have 2 moles of O in the beginning...

So ?

Thank you!
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Feb1-14, 05:25 PM
P: 8
Although 2H2O ==> 2H2 + 2O does not violate Lavoisier's law, oxigen is a diatomic molecule and therefore the substance 'O' that appears in that equation doesn't truly exist.

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