(D) The combustion reaction is: $C_{(s)} + O_{2(g)} \rightarrow CO_{2(g)}$; $\Delta H = -x \ kJ \ mol^{-1}$.Heat released $(Q)$ is calculated as: $Q =

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

(D) The combustion reaction is: $C_{(s)} + O_{2(g)} \rightarrow CO_{2(g)}$; $\Delta H = -x \ kJ \ mol^{-1}$.Heat released $(Q)$ is calculated as: $Q = C \times \Delta T = 20.0 \ kJ \ K^{-1} \times (300 \ K - 298 \ K) = 20.0 \ kJ \ K^{-1} \times 2 \ K = 40 \ kJ$.This heat is released by $2.4 \ g$ of carbon $(C)$.For $1 \ mole$ of $C$ $(12 \ g)$:$Q = \frac{40 \ kJ}{2.4 \ g} \times 12 \ g = 200 \ kJ \ mol^{-1}$.Since $\Delta n_g = 0$ for the reaction,$\Delta H = \Delta U = -200 \ kJ \ mol^{-1}$.Therefore,$x = 200$.

Class 11 Chemistry Thermodynamics Mix Examples-Thermodynamics and Thermochemistry

Difficult

$2.4 \ g$ coal is burnt in a bomb calorimeter in excess of oxygen at $298 \ K$ and $1 \ atm$ pressure. The temperature of the calorimeter rises from $298 \ K$ to $300 \ K$. The enthalpy change during the combustion of coal is $-x \ kJ \ mol^{-1}$. The value of $x$ is. (Nearest Integer) (Given: Heat capacity of bomb calorimeter $20.0 \ kJ \ K^{-1}$. Assume coal to be pure carbon)

JEE MAIN 2022 All JEE MAIN

A
$201$
B
$202$
C
$203$
D
$200$

Explore More

Browse All

Question Bank

All Subjects

Class 11 Questions

Class 11

Chemistry Questions

Chapter

Thermodynamics

Subtopic

Mix Examples-Thermodynamics and Thermochemistry

Previous Year

JEE MAIN 2022 Paper All JEE MAIN years →

The heat associated with the combustion of liquid benzene at constant volume is $-3268 \ kJ \ mol^{-1}$. Calculate the change in enthalpy when this reaction occurs at $300 \ K$ $(R = 8.314 \ J \ K^{-1} \ mol^{-1})$.

Medium

View Solution

When $1 \ g$ of $NH_4NO_3$ is decomposed in a bomb calorimeter,the temperature of the calorimeter increases by $6.12 \ K$. If the heat capacity of the system is $1.23 \ kJ/K$,the molar enthalpy of decomposition of $NH_4NO_3$ is ........ $kJ/mol$.

Medium

View Solution

Match the following terms in Column-$I$ with their corresponding descriptions in Column-$II$:
Column-$I$ Column-$II$
$(a)$ Adiabatic process $(1)$ Heat
$(b)$ Isolated system $(2)$ At constant volume
$(c)$ Isothermal change $(3)$ First law of thermodynamics
$(d)$ Path function $(4)$ No exchange of matter and energy
$(e)$ State function $(5)$ No heat exchange
$(f)$ $\Delta U = q$ $(6)$ Constant temperature
$(g)$ Law of conservation of energy $(7)$ Internal energy
$(h)$ Reversible process $(8)$ $p_{ext} = 0$
$(i)$ Free expansion $(9)$ At constant pressure
$(j)$ $\Delta H = q$ $(10)$ Infinitely slow process involving multiple equilibrium states
$(k)$ Intensive property $(11)$ Entropy
$(l)$ Extensive property $(12)$ Pressure,$(13)$ Specific heat

Medium

View Solution

Enthalpy of formation of $CO_{2(g)}$,$H_2O_{(l)}$ and $C_6H_{12}O_{6(s)}$ are $-393$,$-286$ and $-1170 \ kJ \ mol^{-1}$ respectively. The quantity of heat liberated when $18 \ g$ of $C_6H_{12}O_{6(s)}$ is burnt completely in oxygen is (in $kJ$)

MediumAP EAMCET 2025

View Solution

$\Delta H_f^o$ of water is $-285.5\, kJ\, mol^{-1}$. If enthalpy of neutralisation of monoacidic strong base is $-57.3\, kJ\, mol^{-1}$,$\Delta H_f^o$ of $OH^{-}$ ion will be $.....\, kJ\, mol^{-1}$.

Medium

View Solution

Vedclass Products

For Students

Vedclass Test Series

Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.

Start Free Trial

For Teachers

Exam Paper Generator

Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.

Try Free

For Institutes

Online Exam Module

Live online exams with unlimited students, 360° analytics & white-label branding.

See Demo

Column-$I$	Column-$II$
$(a)$ Adiabatic process	$(1)$ Heat
$(b)$ Isolated system	$(2)$ At constant volume
$(c)$ Isothermal change	$(3)$ First law of thermodynamics
$(d)$ Path function	$(4)$ No exchange of matter and energy
$(e)$ State function	$(5)$ No heat exchange
$(f)$ $\Delta U = q$	$(6)$ Constant temperature
$(g)$ Law of conservation of energy	$(7)$ Internal energy
$(h)$ Reversible process	$(8)$ $p_{ext} = 0$
$(i)$ Free expansion	$(9)$ At constant pressure
$(j)$ $\Delta H = q$	$(10)$ Infinitely slow process involving multiple equilibrium states
$(k)$ Intensive property	$(11)$ Entropy
$(l)$ Extensive property	$(12)$ Pressure,$(13)$ Specific heat

Similar Questions

The heat associated with the combustion of liquid benzene at constant volume is $-3268 \ kJ \ mol^{-1}$. Calculate the change in enthalpy when this reaction occurs at $300 \ K$ $(R = 8.314 \ J \ K^{-1} \ mol^{-1})$.

When $1 \ g$ of $NH_4NO_3$ is decomposed in a bomb calorimeter,the temperature of the calorimeter increases by $6.12 \ K$. If the heat capacity of the system is $1.23 \ kJ/K$,the molar enthalpy of decomposition of $NH_4NO_3$ is ........ $kJ/mol$.

Enthalpy of formation of $CO_{2(g)}$,$H_2O_{(l)}$ and $C_6H_{12}O_{6(s)}$ are $-393$,$-286$ and $-1170 \ kJ \ mol^{-1}$ respectively. The quantity of heat liberated when $18 \ g$ of $C_6H_{12}O_{6(s)}$ is burnt completely in oxygen is (in $kJ$)

$\Delta H_f^o$ of water is $-285.5\, kJ\, mol^{-1}$. If enthalpy of neutralisation of monoacidic strong base is $-57.3\, kJ\, mol^{-1}$,$\Delta H_f^o$ of $OH^{-}$ ion will be $.....\, kJ\, mol^{-1}$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module