Heat of Formation of Benzene from Combustion Data | Hess Law | JEE Main 2025

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In this video, we solve a JEE Main 2025 Chemistry Previous Year Question (PYQ) based on Hess’s law and enthalpy of formation.

📌 Exact Question (JEE Main 2025 – 28th January Evening Shift):

Consider the following data:
Heat of formation of CO₂(g) = −393.5 kJ mol⁻¹
Heat of formation of H₂O(l) = −286.0 kJ mol⁻¹
Heat of combustion of benzene = −3267.0 kJ mol⁻¹

The heat of formation of benzene is ______ kJ mol⁻¹ (nearest integer).

🧠 EXAM STEP used in this video:
• Write balanced combustion equation of benzene
• Apply Hess’s law correctly
• Use formation enthalpies of CO₂ and H₂O
• Avoid SIGN TRAP in thermochemistry
• Convert combustion data into formation enthalpy

This is a COMMON MISS question due to:
• Incorrect balancing
• Wrong sign usage
• Mixing formation and combustion enthalpies

📘 Exam: JEE Main 2025
📘 Subject: Chemistry
📘 Chapter: Thermodynamics / Thermochemistry

This video will help you:
✔ Master Hess’s law numericals
✔ Avoid sign convention mistakes
✔ Save time in the exam
✔ Secure SAFE +5 marks

Watch till the end for the FINAL CHECK most students skip.

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