Consider the Following Reaction and Its Corresponding Thermodynamic Data

question 46

Multiple Choice

Consider the following reaction and its corresponding thermodynamic data:
NH₃ (g) + HCl (s) →NH₄Cl (s) D H ° = - 175.9 kJ/mol and D S ° = - 284.6 J/mol × K At what approximate temperature does this reaction cross over from being considered spontaneous to being non-spontaneous?

• A) It won't cross over. It will always be spontaneous.
• B) It won't cross over. It will always be non-spontaneous.
• C) 50.1 K
• D) 618 K
• E) 1618 K

---

Definitions:

Perfectly Competitive

A market structure characterized by a large number of small firms, identical products, and free entry and exit which leads to firms earning normal profits in the long run.

Monopolist

A single seller in a market, who has significant control over the price and supply of a product.

Price Per Unit

The cost assigned to a single unit of a good or service.

Marginal Revenue

The profit derived from the sale of an additional item of a product or service.