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)

1200 g $mol^{-1}$

Answer 2

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 $=1217.39\,g\,mol^{-1}$