Whats the concentration of Feso4 in FeNa EDTA?

Answer 1

Your question is extremely vague. The pedantic answer is none.
Assuming there's some in there as an impurity from the manufacturing process, it will depend on how rigorously it has been purified, which will depend in turn on the product to which you're referring. More information is needed. If you refer to a specific product, the manufacturer will certainly know.