If one molecule of hemoglobin contains 4 iron atoms, and they constitute #0.335%# by mass of hemoglobin, what is the molar mass of hemoglobin?
1 Answer
Apr 25, 2016
Explanation:
Let molecular mass of heamoglobin molecule be
One molecule of heamoglobin contains
#=55.85" each"# ,
Total mass of iron in one molecule of heamoglobin
#=4xx55.85=223.4#
To calculate the percentage of iron:
#M# amu of heamoglobin has iron#=223.4#
#100# amu of heamoglobin has iron#=223.4/Mxx100#
Equating to the given value,
#223.4/Mxx100=0.335#
Solving for
#M=223.4/0.335xx100#
#=66686.57gmol^-1# , rounded to two decimal places.
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At some places the iron percentage in heomoglobin is given as
#M=66982.9085gmol^-1#