When 0560 G of Na(s)reacts with Excess F₂(g)to Form NaF(s), 13

question 5

Multiple Choice

When 0.560 g of Na(s) reacts with excess F₂(g) to form NaF(s) , 13.8 kJ of heat is evolved at standard-state conditions. What is the standard enthalpy of formation ( $\Delta$ H°_f) of NaF(s) ?

• A)24.8 kJ/mol
• B)570 kJ/mol
• C)-24.8 kJ/mol
• D)-7.8 kJ/mol
• E)-570 kJ/mol

---

Definitions:

Observer Bias

A form of cognitive bias that occurs when researchers' expectations, beliefs, or preferences influence their observations and recording of data, potentially affecting the validity of the results.

Psychoanalytic Psychology

A branch of psychology focusing on the influence of unconscious mind on human behavior, founded by Freud.

Freud's Ideas

Freud's ideas revolve around psychoanalytic theories, including the unconscious mind, defense mechanisms, the structure of the personality (id, ego, superego), and the psychosexual stages of development.

Surveys

A method of gathering information from a sample of people, typically by asking them questions to understand opinions, behaviors, or characteristics of a larger population.