Solid Aluminum and Gaseous Oxygen React in a Combination Reaction

question 157

Multiple Choice

Solid aluminum and gaseous oxygen react in a combination reaction to produce aluminum oxide: 4Al (s) + 3O₂ (g) → 2Al₂O₃ (s)
In a particular experiment, the reaction of 2.5 g of Al with 2.5 g of O₂ produced 3.5 g of Al₂O₃. The % yield of the reaction is ________.

• A)74
• B)37
• C)47
• D)66
• E)26

---

Definitions:

Positive Economics

A branch of economics that seeks to describe and explain the economy as it actually is, without making judgments about its effectiveness.

Judgments

Decisions or conclusions reached after consideration, often in a legal context or in personal assessment.

Empirical Economics

The branch of economics that focuses on using data and statistical methods to analyze and test economic theories.

Economic Theories

The principles and models that aim to explain how economies work and how economic agents interact.