Question

A biomolecule contains 0.2% Fe2+ by mass. The
minimum molecular mass of the biomolecule is
(Atomic mass of Fe = 56 )
(1) 16000 u
(2) 18000 u
(3) 100 u
(4) 28000 u​

Answer 1

answer : option (4) 28000 u

explanation : a/c to question,

A biomolecule contains 0.2% of Fe²+ by mass.

so, 0.2% of molecular mass of the biomolecule = atomic mass of iron

given, atomic mass of iron = 56 u

so 0.2 % of molecular mass of the biomolecule =

⇒0.2 /100 × molecular mass of the biomolecule = 56

⇒1/500 × molecular mass of the biomolecule = 56

⇒molecular mass of the biomolecule = 56 × 500 = 28000 u

hence, option (4) is correct choice.