2. The rate of the reaction between the protein hemoglobin (represented by Hb) a

Question

2. The rate of the reaction between the protein hemoglobin (represented by Hb) and carbon monoxide was studied at 20 °C. The following data were collected trial initial [Hb] nitial CO] initial rate (umol/L) (umol/L) (umol/L s) 2.21 4.42 4.42 1.00 1.00 3.00 0.619 1.24 3.71 a. Write the rate law for the reaction between hemoglobin and CO and provide the value for the rate constant. b. CO and O2 competitively bind to hemoglobin. Draw the molecular orbital diagram for each (CO and O2). Which molecular orbital is used in each case to donate electron density to the iron metal center of hemoglobin? c. The geometry around the iron center in hemoglobin before being bound by oxygen is a distorted square pyramidal. Provide the d orbital splitting energy diagram for a square pyramidal geometry using Crystal Field Theory. All orbitals must be labelled

Explanation / Answer

a.The rate law for this reaction is=k[HB]1 [CO]1.

The value of the rate constant is k=0.28.

b.the electronic configuration of carbon and oxygen are 1s22s22p2 and 1s22s22p4.There are four electrons in the outershell of carbon and 6 electrons in the outer shell of oxygen.Thus 10 electrons should be accomdated in the outer shell of CO.

For atomic orbital diagram of oxygen the electronic configuration is 1s22s22p4.

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