Which of the Following Has a Standard Enthalpy of Formation

question 141

Multiple Choice

Which of the following has a standard enthalpy of formation value (ΔH°_f) of zero at 298 K?

• A) H₂O(g)
• B) O(g)
• C) H₂O(l)
• D) O₂(g)
• E) O₃(g)

---

Definitions:

Systematically Observes

Methodically and rigorously watching and recording phenomena or behaviors for analysis.

Association

A connection or relationship between two ideas, thoughts, or events, often based on experiences or learning.

Naturalistic Observation

A research method involving the systematic observation of subjects in their natural environment without interference.

Careful Observation

The act of diligently watching or noting phenomena as they occur, often for the purpose of collecting data for research or gaining a deeper understanding of a topic.