Please Solve I need to check my answers: Carbon monoxide is toxic because it bon

Question

Please Solve I need to check my answers:

Carbon monoxide is toxic because it bonds much more strongly to the iron in hemoglobin (Hgb) than does O_2- Consider the following reactions and approximate free energy changes: Using these data, estimate the equilibrium constant value at 25 deltaC for the following reaction: Sodium chloride is added to water (at 25 degreeC) until it is saturated. Calculate the CI^- concentration in such a solution. Useful data are provided below. Is the reaction shown below spontaneous under standard conditions at 25 degree C? Will this reaction be spontaneous at 25 degreeC given the following amounts of materials? If gaseous H_2 and O_2 are carefully mixed and left alone, they can remain intact for millions of years. Is this "stability" a function of thermodynamics or of kinetics? Give a valid reason to support your choice.

Explanation / Answer

1. Invert first reaction,

HgbO2 ---> Hgb + O2 dGo = 70 kJ

Add to second equation.

HgbO2 + CO ---> HgbCO + O2 ---- dGo = 70 - 80 = -5 kJ

dGo = -RTlnKc

-5 x 1000 = -8.314 x 298 ln Kc

equilibrium constant Kc = 7.524

2. dGorxn = (-262 - 131) - (-384) = -9 kJ

dGo = -RTlnK

-9 x 1000 = -8.314 x 298 lnK

K = 37.81

K = [Na+][Cl-]

with x amount of salt in water

37.81 = x^2

[Cl-] = x = 6.15 M

3. a) dGorxn = (-137.16) - (-166.2) = +29.04 kJ/mol

dG is +ve so the reaction is non-spontaneous

b) dGo = -RTlnK

            = -8.314 x 298 ln(0.08 x 0.02^2/1.2)

            = +26.09 kJ/mol

dG is +ve, so the reaction would be non-spontaneous

4. Gaseous H2 and O2 does not react with each other at normal conditions. This is due to the thermodynamic constraints. The energy to break the H-H and O-O bond is not present and hence the gases behave as non-reactive under these situation.

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