(A) Given: $n = 3 \ mol$,$q_p = \Delta H = 229 \ J$,$\Delta T = 2.55 \ K$. At constant pressure,$\Delta H = n \times C_p \times \Delta T$. $C_p = \fra

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

(A) Given: $n = 3 \ mol$,$q_p = \Delta H = 229 \ J$,$\Delta T = 2.55 \ K$. At constant pressure,$\Delta H = n \times C_p \times \Delta T$. $C_p = \frac{229}{3 \times 2.55} \approx 29.93 \ J \ K^{-1} \ mol^{-1} \approx 30 \ J \ K^{-1} \ mol^{-1}$. For an ideal gas,$C_v = C_p - R$. Using $R = 8.314 \ J \ K^{-1} \ mol^{-1}$,$C_v = 30 - 8.314 = 21.686 \ J \ K^{-1} \ mol^{-1} \approx 21.7 \ J \ K^{-1} \ mol^{-1}$.

Class 11 Chemistry Thermodynamics Mix Examples-Thermodynamics and Thermochemistry

Medium

When $3 \ mol$ of $Ar_{(g)}$ is supplied with $229 \ J$ of heat at constant pressure,the temperature of the sample increases by $2.55 \ K$. Calculate the molar heat capacity of the gas at constant volume.

A
$21.7 \ J \ K^{-1} \ mol^{-1}$
B
$30.7 \ J \ K^{-1} \ mol^{-1}$
C
$14.7 \ J \ K^{-1} \ mol^{-1}$
D
$16.7 \ J \ K^{-1} \ mol^{-1}$

Explore More

Browse All

Question Bank

All Subjects

Class 11 Questions

Class 11

Chemistry Questions

Chapter

Thermodynamics

Subtopic

Mix Examples-Thermodynamics and Thermochemistry

The enthalpy of formation of $H_2O$ is $-68 \ k.cal/mol$. Calculate the enthalpy of formation of $OH^-$. Given that the enthalpy of neutralization of $H^+$ and $OH^-$ is $-13.7 \ k.cal/mol$.

Medium

View Solution

Following data is known about the melting of a compound $AB$: $\Delta H = 9.2 \ kJ \ mol^{-1}$,$\Delta S = 0.008 \ kJ \ K^{-1} \ mol^{-1}$. Its melting point is:

MediumAIIMS 2000

View Solution

One mole of an ideal monoatomic gas at temperature $T$ expands adiabatically in an insulated flask from $1 \ L$ to $2 \ L$ against an external pressure of $1 \ atm$. What is the final temperature?

Difficult

View Solution

Two moles of an ideal monoatomic gas are allowed to expand adiabatically and reversibly from $300 \ K$ to $200 \ K$. The work done in the process will be $..... \ kJ$.

Medium

View Solution

The energy of combustion per mole of $H_2$,$LPG$,and octane follows the order:

DifficultKVPY 2021

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

When $3 \ mol$ of $Ar_{(g)}$ is supplied with $229 \ J$ of heat at constant pressure,the temperature of the sample increases by $2.55 \ K$. Calculate the molar heat capacity of the gas at constant volume.

Similar Questions

The enthalpy of formation of $H_2O$ is $-68 \ k.cal/mol$. Calculate the enthalpy of formation of $OH^-$. Given that the enthalpy of neutralization of $H^+$ and $OH^-$ is $-13.7 \ k.cal/mol$.

Following data is known about the melting of a compound $AB$: $\Delta H = 9.2 \ kJ \ mol^{-1}$,$\Delta S = 0.008 \ kJ \ K^{-1} \ mol^{-1}$. Its melting point is:

One mole of an ideal monoatomic gas at temperature $T$ expands adiabatically in an insulated flask from $1 \ L$ to $2 \ L$ against an external pressure of $1 \ atm$. What is the final temperature?

Two moles of an ideal monoatomic gas are allowed to expand adiabatically and reversibly from $300 \ K$ to $200 \ K$. The work done in the process will be $..... \ kJ$.

The energy of combustion per mole of $H_2$,$LPG$,and octane follows the order:

Vedclass Test Series

Exam Paper Generator

Online Exam Module