Hemoglobin is the protein that transports oxygen in mammals. Different species o

Question

Hemoglobin is the protein that transports oxygen in mammals. Different species of mammals have slightly different forms of hemoglobin. One form of hemoglobin is 0.328% Fe by mass, and each hemoglobin molecule contains four iron atoms. Calculate the molar mass of this form of hemoglobin. Make sure to include units of g/mol. Enter your answer in Scientific notation with three significant figures. The Scientific notation for 2 x 10-4 would be written as 2E-4. Remember, a hemoglobin molecule contains 4 atoms of Fe and the mass % of Fe is given. From this information and by looking up the molar mass of iron, you can calculate the moles of hemoglobin in 100.00 g of hemoglobin. Molar mass = mass/moles; To determine the molar mass, first assume 100.00 g of hemoglobin, then calculate the moles of hemoglobin in 100.00 g of hemoglobin, and finally divide 100.00 g by the calculated moles of hemoglobin. This will give you the mass of one mole of hemoglobin (the molar mass).

Explanation / Answer

MM of iron = 55.85

mass of 4 iron atom = 55.85 * 4 = 223.4 gms

0.328 % correspond to 223.4 gms

100 % correspond to = 223.4 *100/0.328 = 68109.76 gm

MM of haemoglobin = 68109.76 gms = 6.8 E4 gms

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