Hello, i need help with this chemical engineering problem (please provide every step for the resolution, i would prefer if you send me pics of all the steps).

A patient after surgery has lost a considerable volume of blood with a consequent decrease in the concentration of hemoglobin. We are interested in studying the processes leading to the re-establishment of the hemoglobin concentration to the value before the operation. The rate at which red blood cells form depends in part on the availability of iron in destroyed red blood cells and ferritin in the liver. We can assume that the rate of incorporation of Fe into hemoglobin is equal to 21 mg of Fe per day. Assume that the rate of formation of hemoglobin equals the rate of incorporation of Fe into hemoglobin. The rate of disappearance of hemoglobin can be described with a first order kinetics with respect to the concentration of hemoglobin in the blood where the kinetic constant (k) is equal to 8*10^-3 / days. Assume that each hemoglobin molecule contains 4 iron molecules (Fe). The molecular weights of hemoglobin and Fe are 66000 g/mol and 55.85 g/mol, respectively.

Exercise:

a) Write the mass balance for blood hemoglobin to quantify the temporal change in hemoglobin concentration after blood loss.

b) How long does it take to recover half of the lost hemoglobin?