1)Hemoglobin is the protein that transports oxygen in mammals. Hemoglobin is 0.3
ID: 763038 • Letter: 1
Question
1)Hemoglobin is the protein that transports oxygen in mammals. Hemoglobin is 0.342% Fe by mass, and each hemoglobin molecule contains four iron atoms. Calculate the molar mass of hemoglobin. 2)Gallium, Ga, has two isotopes of atomic mass 68.926 u and 70.926 u. Write the full symbol for each isotope (give both A and Z for each isotope). How many protons, and how many neutrons are present in the nucleus of each isotope? What is the natural abundance of each isotope, if the average atomic mass of gallium is 69.72 u?Explanation / Answer
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In each molar mass (Formula mass in g) of Heamoglobin there will be 4 x 55.85 (atomic mass Fe) = 223.4 g Fe
This is 0.342 % 0f the mass of the molecule so the molar mass of the full molecule = (100 / 0.342) x 223.4 g = 65321.6 g
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