Entry Exam Category: High School Equivalency Exams
Course: General Education Development (GED)
Exam: GED Science and Practice Test
Practice Question
Extract
The energy density of a fuel is the amount of useful energy stored in a specific amount of that fuel. The energy density, measured in megajoules per kilogram (MJ/kg), is related to the chemical composition of the fuel.
The chemical composition and energy density of four fuels are shown in the table. Ethane, which has a chemical composition of C2H6, is also a fuel. What is the predicted energy density of ethane?
Answer Choices
- A: 45 MJ/kg
- B: 42 MJ/kg
- C: 52 MJ/kg
- D: 48 MJ/kg
Correct Answer: C
Rationale: Ethane’s energy density is typically around 52 MJ/kg, higher than methane due to its structure.