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It does not matter that much. Most of the things are by choice, with people choosing to but the most electronegative atom first. Ideally if following the pattern of the rest of the molecular formula you would put O (the most electron negative) first
It doesn't make a significant difference. H2O and OH2 signal that they are both neutral water molecules. However, the OH2 from what I have noticed gives specificity of whether it will bond to the Hydrogen atom or the oxygen atom of the water molecule
I do not think it matters since both still represent a water molecule. The reason why they are written in different orders is that it represents which atom is bonded to the central atom. In the case of H20, since hydrogen can only form one bond, and it is already bonded to Oxygen, only the oxygen can bond to something else. That is why it is written in the order of OH2.
I don't think how you write it matters too much, especially since the final is multiple choice. I just recall that Professor Lavelle wrote OH2 in lecture to show that oxygen was what was donating electrons, not Hydrogen.
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