15.2 Entropy & Spontaneity

Ethene is produced according to the following gas-phase synthesis:

2C (s)  + 2H₂ (g) → C₂H₄ (g) 

Thermodynamic data for the components of this equilibrium are

The free energy change for this reaction at 298 K is:

Which statements are correct for the following reaction?

1.   The reaction will be feasible at high temperatures 
2.   The reaction will never be feasible 
3.   The reaction becomes more disordered

Which of the following equations is used when calculating the temperature, in Kelvin, at which a reaction becomes feasible if ΔH^Θ = x and ΔS^Θ = y.

The ΔG^ϴ_f values for the following substances are shown.

Which of the following is the correct calculation to determine ΔG^ϴ? 

4NH₃ (g) + 5O₂ (g) ⇌ 6H₂O (g) + 4NO (g)