Final answer:
The molar heat capacity of Au(s) is approximately 25 J/(mol·K) according to the rule of Dulong and Petit.
Step-by-step explanation:
The molar heat capacity of Au(s) can be calculated using the rule of Dulong and Petit. According to this rule, the molar heat capacity of most metallic elements is approximately 25 J/(mol·K). This value is an average that applies to a wide range of metallic elements, including gold (Au). So, the molar heat capacity of Au(s) is approximately 25 J/(mol·K).