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 iron
• C. $1$ mole of haemoglobin contains $224$ g 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 iron

$Ironinhaemoglobin=\frac{4\times 56}{65000}\times 100=0.35$
$Ironinonemolehaemoglobin=4\ast 56=224g$
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