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Question

Myoglobin stores oxygen for metabolic processes in muscles. Chemical analysis shows that it contains 0.35% Fe by mass. If there is one Fe atom and 6 N atoms per molecule of myoglobin, which of the following option is not correct about myoglobin?
(Molar Mass of Fe = 56 g/mol)

A
Molar mass of myoglobin is 16000 g/mol
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B
One molecule of myoglobin contains 84 gm nitrogen atoms.
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C
% content of nitrogen in myoglobin is 0.525%
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D
If one molecule of myoglobin can absorb one molecule of oxygen gas then after absorption of oxygen there will 0.2% increase in mass.
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Solution

The correct option is B One molecule of myoglobin contains 84 gm nitrogen atoms.
Let, molar mass of myoglobin be x. As x contains 0.35% of Fe.
So, x×0.35100=56
x=56×1000.35=16000 g/mol
(a) Molar mass of Myoglobin is 16000 g/mol
(b) As one molecule of myoglobin contains 6 nitrogen i.e. 84 amu nitrogen atom.
(c) Fraction of nitrogen atoms present is given by =84×10016000 =0.525%
(d) When one molecule of myoglobin absorbs one O2 (molar mass=32 g/mol)
% increase of oxygen =32×10016000=0.2%

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