Question

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

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

Answer 1

Answer: (A), (C)

iron content in haemoglobin is $0.35$% by mass
$1$ mole of haemoglobin contains $224$g of iron

Iron in haemoglobin$=\frac{4\times 56}{65000}\times 100=0.35$%.
Iron in one mole haemoglobin$=4\times 56=224g$.
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.