In the Mond process for the purification of nickel, carbon monoxide is reacted with heated nickel to produce Ni (CO) 4, which is a gas and can therefore be separated from solid impurities:

Ni (s) + 4CO (g) ⇌ Ni (CO) 4 (g)

Given that the standard free energies of formation of CO (g) and Ni (CO) 4 (g) are - 137.3 and - 587.4 kJ/mol, respectively,

calculate the equilibrium constant of the reaction at 86.0°C.

Assume that ΔG o f is temperature-independent.

Question

Chemistry

Javion Leblanc

16 February, 10:06

In the Mond process for the purification of nickel, carbon monoxide is reacted with heated nickel to produce Ni (CO) 4, which is a gas and can therefore be separated from solid impurities:

Ni (s) + 4CO (g) ⇌ Ni (CO) 4 (g)

Given that the standard free energies of formation of CO (g) and Ni (CO) 4 (g) are - 137.3 and - 587.4 kJ/mol, respectively,

calculate the equilibrium constant of the reaction at 86.0°C.

Assume that ΔG o f is temperature-independent.

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Boots · Answer 1

from ΔG = Summation of ΔGproducts - Summation of ΔGreactants Given that the standard free energies of formation of CO (g) = - 137.3 and Ni (CO) 4 (g) = - 587.4 kJ/mol. R = gas constant = 8.314 Temperature = 86.0°C + 273 = 359k ΔG reaction = - 587.4 kJ/mol - (4 x - 137.3kJ/mol) = - 38.2kJ/mol

From the vant hoff Isotherm equation; ΔG = - RTlnk lnk = - 38.2kJ/mol / 359 x 8.314 lnk = - 0.0127, k = 0.987