What incorrect information is given by the formula MgOH2 instead of the correct formula, Mg(OH)2 ?

3 answers

Is that not obvious?
i don't understand the question though.
Mg(OH)2 means we have 1 Mg, 2 O, and 2 H atoms.
MgOH2 means we have 1 Mg, 1 O and 2 H atoms.
The first formula is magnesium hydroxide. The second one doesn't exist.
So the incorrect information is that the wrong formula gives the wrong number of atoms and the wrong ratio of atoms to one another.