The answer is 155 pm, hope this helps!
Answer:
Covalent bond between identical atoms
Covalent bonds occur between identical atoms or between different atoms whose difference in electronegativity is insufficient to allow transfer of electrons to form ions. ... The two hydrogen atoms are attracted to the same pair of electrons in the covalent bond.
He put iron with sulfur and oxygen and it had a few more errors and iron is a metal the other two are nonmetals