Answer
The molecular mass of myoglobin =16426.5 = $1.6 \times10^{4}$
Work Step by Step
Myoglobin contains one Fe atom.
Therefore the weight of Fe in myoglobin = Atomic weight of Fe = 55.85
Percentage of Fe = 0.34
Percentage of an element=(Total weight of the element in the compound$\times$100)$\div$ Molecular mass of the compound.
Then,
The molecular mass of the compound= (Total weight of the element in the compound$\times$100)$\div$Percentage of an element.
Therefore,
The molecular mass of myoglobin = ($55.85\times$100)$\div$0.34 =16426.5 = $1.6 \times10^{4}$
