Concept explainers
Chemical analysis shows that hemoglobin contains 0.34 percent of Fe by mass. What is the minimum possible molar mass of
hemoglobin? The actual molar mass of hemoglobin is about 65.000 g. How do you account for the discrepancy between your minimum value and the actual value?
Interpretation:
The minimum molar mass of hemoglobin with the given information is to be determined with given percent of
Concept introduction:
A molecule of hemoglobin composed of four polypeptide subunits: two alpha chains and two beta chains.
Iron in heme group exists in oxidation state of +2 and each
The number of moles of compound is calculated as:
The amount of hemoglobinin one mole of iron is calculated as:
The actual mass of hemoglobin and estimated minimum molar mass is compared as:
Answer to Problem 73AP
Solution:
Explanation of Solution
Given information: Hemoglobin contains
A
The molar mass of iron is
Substitute
In one mole of iron, the amount of hemoglobin is given as follows:
Therefore, the minimum molar mass of hemoglobin is
The actual molar mass of hemoglobin is
The actual mass of hemoglobin and estimated minimum molar mass is compared as follows:
The difference between the estimated minimum value of hemoglobin and the actual value can be explained by considering the fact that there are four iron atoms per mole of hemoglobin.
The minimum molar mass of hemoglobin is
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Chapter 22 Solutions
Chemistry
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