Exhibit 17-3 Consider the reaction below and its corresponding thermodynamic data to answer the following problem(s). NH 3 (g) + HCl (s)→NH 4 Cl (s) D H ° = - 175.9 kJ/mol and D S ° = - 284.6 J/mol × K
-Refer to Exhibit 17-3. Which statement below is true regarding this reaction?

Question

Quizplus · Accepted Answer

The reaction is spontaneous when ΔG is negative. ΔG can be calculated using the equation ΔG = ΔH - TΔS where T is the temperature in Kelvin. As ΔH is negative and ΔS is also negative, ΔG will be negative at lower temperatures. However, as the temperature increases, the negative TΔS term will become more significant and may eventually overcome the negative ΔH term, causing ΔG to become positive and the reaction to become non-spontaneous. Therefore, the reaction is spontaneous at relatively lower temperatures and non-spontaneous at higher temperatures.

Exhibit 17-3 Consider the Reaction Below and Its Corresponding Thermodynamic