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Case study·Hard exam skill (4/5)·Calculator allowed

Difficulty guide

The label describes the problem, not your ability.

1/5 - Foundational

Warm-up setup; checks one basic idea.

2/5 - Routine exam skill

Normal syllabus skill; usually one main rule or interpretation.

3/5 - Standard multi-step

Exam-style problem with multiple steps or a common trap.

4/5 - Hard exam skill

High-end exam problem; combines methods carefully.

5/5 - Challenge

Stretch problem beyond normal exam pressure.

Question

A fuel-analysis lab compares two fuels. Fuel X has combustion enthalpy −520 kJ mol−1-520\text{ kJ mol}^{-1} and molar mass 40 g mol−140\text{ g mol}^{-1}. Fuel Y has combustion enthalpy −780 kJ mol−1-780\text{ kJ mol}^{-1} and molar mass 60 g mol−160\text{ g mol}^{-1}.
Total: 5 marks

(a) Which fuel releases more heat per mole? (1 mark)

(b) Find heat released per gram for X. (2 marks)

(c) Find heat released per gram for Y. (2 marks)

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cbse-chemistry-11.u5.t5-4.case.005

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