JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 28 June 2022, Shift 2, Chemistry Q82

Question 82 of 90 in this shift, Chemistry question 22 of 30, Section B.

For combustion of one mole of magnesium in an open container at 300 K and 1 bar pressure,

\Delta_C H^{\ominus} = -601.70

kJ mol

^{-1}

, the magnitude of change in internal energy for the reaction is __________ kJ . (Nearest integer) (Given : R=8.3 J K

^{-1}

mol

^{-1}

)

Official answer

600

NTA final key.

Chapter: Thermodynamics (Chemistry)
Topic: Enthalpy and Hess's Law
Idea tested: Relation Between ΔH and ΔU

Same idea in other shifts

Asked 10× in all

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.