Calculate the Standard Enthalpy of Formation of Liquid Methanol, CH₃OH(l) $\rarr$

question 10

Multiple Choice

Calculate the standard enthalpy of formation of liquid methanol, CH₃OH(l) , using the following information: C(graph) + O₂ $\rarr$ CO₂(g) $\Delta$ H° = -393.5 kJ/mol
H₂(g) + (1/2) O₂ $\rarr$ H₂O(l) $\Delta$ H° = -285.8 kJ/mol
CH₃OH(l) + (3/2) O₂(g) $\rarr$ CO₂(g) + 2H₂O(l) $\Delta$ H° = -726.4 kJ/mol

• A)-1,691.5 kJ/mol
• B)-238.7 kJ/mol
• C)1691.5 kJ/mol
• D)47.1 kJ/mol
• E)-47.1 kJ/mol

---

Definitions:

Ex Post Facto

A research design in which the researchers retrospectively investigate the cause-and-effect relationship between variables, after the events have occurred.

Participant Groups

Divisions or categories of subjects who take part in a research study, often differentiated by certain variables or treatments.

Subject Variables

Characteristics of study participants that are not manipulated but can affect the outcome of an experiment, such as age, gender, intelligence, or personality.

Field Experiments

Research studies conducted in natural settings outside the laboratory to understand real-world behaviors and outcomes.