The standard free energies of formation of H2S(g) and CdS(s) at 1000°C are -49.0 kJ/mol and -127.2 kJ/mol respectively. Use these data to predict whether H2(g) will reduce CdS(s) to metallic Cd at this temperature.
A. ΔG = -78.2 kJ/mol and H2 reduces CdS
B. ΔG = -39.1 kJ/mol and H2 reduces CdS
C. ΔG = 0 kJ/mol and the reaction is at equilibrium
D. ΔG = 78.2 kJ/mol and the reaction is not feasible
Answer: Option D
Standard entropy of crystalline carbon monoxide (in kJ/mol) at 0 K is around
A. 0.03
B. 2.50
C. zero
D. 5.76
A. nR In(Vf/Vi)
B. zero
C. less than zero
D. greater than zero
A. -12.74 J/K/mol
B. -6.37 J/K/mol
C. 6.37 J/K/mol
D. 12.74 J/K/mol
A. ΔS° = -37.65 J/K/mol; negative sign indicates that there is a decrease in the gaseous species during the reaction
B. ΔS° = -198.7 J/K/mol; negative sign indicates that there is a decrease in the gaseous species during the reaction
C. ΔS° = -31.25 J/K/mol; negative sign indicates that there is a decrease in the gaseous species during the reaction
D. ΔS° = +31.25 J/K/mol; positive sign indicates that the reaction is spontaneous
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