Question

A compound has hemoglobin-like structure. It has one `Fe` and contains `4.6%` of `Fe`. The approximate molecular mass is
A. `1200 u`
B. `1000 u`
C. `1400 u`
D. `1600 u`

Answer 1

Correct Answer - A
Percent `Fe = ("Mass of Fe per mole of compound")/("Molar mass of compound") xx 100%`
`4.6% = (56g)/("Molar mass of compound") xx 100%`
(Only one`Fe` atom)
Thus, molar mass of compound
`= (100 %)/(4.6%) xx 56 g =1217g`
Hence, approximate molecular mass is `1200u`.