Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app

JEE Main 202227 JulyEvening Shift

Exam: JEE Main
Year: 2022
Date: 27 July
Shift: Evening Shift
Subject: Chemistry
Chapter: Thermodynamics (C)

JEE Main 2022 · 27 July · Evening Shift · Chemistry · Thermodynamics (C)

A gas ( Molar mass = 280g mol ^ - 1 ) was burnt in excess O _ 2 in...

A gas ( Molar mass

= 280g{mol}^{- 1}

) was burnt in excess

{O}_{2}

in a constant volume calorimeter and during combustion the temperature of calorimeter increased from

298 . 0K

to

298 . 45K

. If the heat capacity of calorimeter is

2 . 5kJ{K}^{- 1}

and enthalpy of combustion of gas is

9kJ{mol}^{- 1}

then amount of gas burnt is____

g

.

Correct answer

0

Step-by-step solution

Let $xg$ is burnt
Moles $= \dfrac{x}{280}$ heat released by $\dfrac{x}{280}mole = 2 . 5 \times 0 . 45kJ$ heat released by $1$ mole $= \dfrac{2 . 5 \times 0 . 45 \times 280}{x}kJ$
$\Delta H = \Delta U + \Delta ngRT$
$\Delta H ≃ \Delta U$
$9 = \dfrac{2 . 5 \times 280 \times 0 . 45}{x}$
$x = 35g$

Practice Thermodynamics (C) on Quantrex Academy →

More from Thermodynamics (C)

An ideal gas ( 0.5 mol), initially at 2 bar pressure, is compressed at a constant… JEE Advanced 2026 List-I contains various physical/chemical processes, and List-II contains combinations of… JEE Advanced 2026 Consider the reaction 2H_2S(g) + 3O_2(g) arrow 2H_2O(l) + 2SO_2(g) The magnitude of… JEE Main 2026 Match List - I with List - II. Given V_1 and V_2 are initial and final volumes… JEE Main 2026 Arrange the following isothermal processes in order of the magnitude of the work ( p - V… JEE Main 2026 Consider the reaction X leftharpoons Y at 300 K. If Δ H^ θ and K are 28.40 kJ mol ^ -1… JEE Main 2026 Consider the following data for the reaction X_2(g) + Y_2(g) leftharpoons 2XY(g) at 600 K… JEE Main 2026 The correct order of molar heat capacities measured at 298 K and 1 bar is : JEE Main 2026 Full Thermodynamics (C) list All JEE Main PYQs