Which of the following values is based on the Third Law of Thermodynamics? A)Δ H° _f = 0 for Al( s)at 298 K B)Δ G° _f = 0 for H ₂( g)at 298 K C)S° = 51.446 J/(mol·K)for Na( s)at 298 K D)q _sys

Question

Which of the following values is based on the Third Law of Thermodynamics? A)Δ H° _f = 0 for Al( s)at 298 K B)Δ G° _f = 0 for H ₂( g)at 298 K C)S° = 51.446 J/(mol·K)for Na( s)at 298 K D)q _sys < 0 for H ₂O( l)→ H ₂O(s)at 0°C E)None of these choices are correct.

Quizplus · Accepted Answer

The Third Law of Thermodynamics states that as a system approaches absolute zero, its entropy approaches a minimum value. Therefore, at absolute zero (0 K), the entropy of a perfectly crystalline substance would be zero. This means that the entropy of a substance at any temperature above 0 K is always positive. Choice C provides the entropy value for Na(s) at 298 K, which is a temperature above absolute zero and therefore based on the Third Law of Thermodynamics.

Which of the Following Values Is Based on the Third