Question

The molar mass of hemoglobin is about $65000gmo{l}^{-1}$. Every hemoglobin contains $4$ iron atoms. Thus:

• A. iron content in haemoglobin is $0.35$%.by mass
• B. $1$ mole of haemoglobin contains $56$g iron
• C. $1$ mole of haemoglobin contains $224$ g iron
• D. if iron content is increased to $0.56$%, molar mass of hemoglobin would be higher than $65000gmo{l}^{-1}$

Answer 1

Answer: (A), (C)

The correct options are
A iron content in haemoglobin is $0.35$%.by mass
C $1$ mole of haemoglobin contains $224$ g iron

Iron in hemoglobin $=\frac{4\times 56}{65000}\times 100=0.35$
Iron in one mole hemoglobin $=4\times 56=224g$
Molar mass of haemoglobin if iron content is $0.56$%$=\frac{100\times 4\times 56}{0.56}=40000<65000$
Thus, molar mass is decreased.