In What Temperature Range Is ΔG° Greater Than Zero for the Formation

question 4

Multiple Choice

In what temperature range is ΔG° greater than zero for the formation of NH₄Cl(s) from NH₃(g) and HCl(g) ?
NH₃(g) + HCl(g) → NH₄Cl(s)
For the reaction,ΔH° = −176.0 kJ and ΔS° = −0.2845 kJ/K.

• A) The temperature must be greater than 619 K.
• B) The temperature must be less than 619 K.
• C) The temperature must be exactly 619 K.
• D) ΔG° is always greater than zero.
• E) ΔG° is never greater than zero.