Nickel metal reacts with carbon monoxide to form tetracarbonyl nickel, Ni(CO)₄:

This reaction is exploited in the Mond process in order to separate pure nickel from other metals. The reaction above separates nickel from impurities by dissolving it into the gas phase. Conditions are then changed so that the reaction runs in the opposite direction to recover the purified metal.

(a) Predict the sign of ΔS° for the reaction as written above.

(b) Use tabulated thermodynamic data to calculate ΔH°, ΔS°, and ΔG° for the reaction.

(c) Find the range of temperatures at which this reaction is spontaneous in the forward direction.

Transcribed Image Text:

Ni(s) + 4 CO(g) → Ni(CO)4(g)