Question

A compound with haemoglobin like structure contains one atom of iron per molecule. If it contains 4.6 % iron, its approximate molecular mass is

• A. 100 g $mol^{-1}$
• B. 1200 g $mol^{-1}$
• C. 1600 g $mol^{-1}$
• D. 1400 g $mol^{-1}$

Answer 1

Answer: (B)

If $4.6$ of $Fe$ is present mass of compound $=100\,g$
If $56$ a.m.u. of $Fe$ is present mass of compound
$=\frac{100}{46} \times56$ a.m.u
$=1217.39$ a.m.u.
Molar mass of compound $=1217.39\,g\,mol^{-1}$