HW 2

Hemoglobin has a molecular weight of about 65000 (g/mol) and can bind as many as four oxygen molecules. An experiment is performed in which 0.085 L of solution containing 6.0 g of de-oxygenated hemoglobin was reacted with an excess of O₂ in a constant-pressure calorimeter (see text) of negligible heat capacity. Calculate the "molar enthalpy of reaction" per oxygen bound if the temperature of the solution rose by 0.044 ^oC. Assume that the solution is sufficiently dilute that the specific heat of the solution is equal to that of water, 4.18 J/K*g.