Answer
$ 1.6 * 10^{4}g$
Work Step by Step
From the mass % Fe in hemoglobin, we can determine the mass of hemoglobin.
% Fe = $\frac{mass of Fe}{mass of Hemoglobin} * 100% $
Solving for the mass of hemoglobin:
Mass of hemoglobin $* 0.34%$ = $55.85g * 100 \% $
Mass of hemoglobin = $\frac{55.85g * 100\%}{0.34\%} = 1.6 * 10^{4}g$