JEE Main 2022 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 29 June 2022, Shift 1, Chemistry Q82

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

17.0 g of

\mathrm{NH_3}

completely vapourises at

-33.42^\circ\mathrm{C}

and 1 bar pressure and the enthalpy change in the process is

23.4\ \mathrm{kJ\ mol^{-1}}

. The enthalpy change for the vapourisation of 85 g of

\mathrm{NH_3}

under the same conditions is ____________ kJ.

Official answer

117

NTA final key (2022 Session 1).

Chapter: Thermodynamics (Chemistry)
Topic: Enthalpy and Hess's Law
Idea tested: Enthalpy of Phase Transitions

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Asked 3× 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 42 of the 174 JEE Main shifts held from 2017 to 2026.