JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 27 July 2022, Shift 1, Chemistry Q84

Question 84 of 90 in this shift, Chemistry question 24 of 30, Section B.

The molar heat capacity for an ideal gas at constant pressure is 20.785 J K

^{-1}

mol

^{-1}

. The change in internal energy is 5000 J upon heating from 300 K to 500 K. The number of moles of the gas at constant volume is __. [Nearest integer] (Given: R = 8.314 J K

^{-1}

mol

^{-1}

)

Official answer

NTA final key.

Chapter: Thermodynamics (Chemistry)
Topic: Enthalpy and Hess's Law
Idea tested: Heat Capacity Relation in Enthalpy

Same idea in other shifts

Asked 3× in all

4 Apr 2026, Shift 1 · Q54Given below are two statements: Statement I: For an ideal gas, heat capacity at constant volume is always greater than the heat capacity…EasyTwo statements
4 Sep 2020, Shift 1 · Q29For one mole of an ideal gas, which of these statements must be true ? (a) U and H each depends only on temperature (b) Compressibility…MediumOther

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.