Which molecular formula is written incorrectly?

co
ch4
br4si
n2

I believe your answer would be the 3rd one

is written incorrectly

Explanation:

In a molecular formula, the central atom in it's lewis structure is written first followed by other bonded atoms.

The least electronegative atom (except H) is the central atom in a lewis structure.

In , Si is the least electronegative atom as Br has higher electronegativity than Si. Therefore Si is the central atom in lewis structure of . So molecular formula of should be written as .

In all other cases, the least electronegative atom have been written first.

So, is written incorrectly.

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.