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JEE Main 27 July 2022, Shift 2, Chemistry Q83

Question 83 of 90 in this shift, Chemistry question 23 of 30, Section B.

A gas (Molar mass=280 g

\mathrm{mol^{-1}}

) was burnt in excess

\mathrm{O_2}

in a constant volume calorimeter and during combustion the temperature of calorimeter increased from 298.0 K to 298.45 K. If the heat capacity of calorimeter is 2.5 kJ

\mathrm{K^{-1}}

and enthalpy of combustion of gas is 9 kJ

\mathrm{mol^{-1}}

then amount of gas burnt is __________ g. (Nearest Integer)

Official answer

NTA final key.

Chapter: Thermodynamics (Chemistry)
Topic: Enthalpy and Hess's Law
Idea tested: Bomb Calorimetry Calculations

Same idea in other shifts

Asked 7× in all

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25 Feb 2021, Shift 1 · Q53The reaction of cyanamide, $\mathrm{NH_2CN_{(s)}}$ with oxygen was run in a bomb calorimeter and $\Delta U$ was found to be $-742.24$ kJ…MediumNumerical value

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.