A sample of argon gas at $1 \mathrm{~atm}$ pressure and $27^{\circ} \mathrm{C}$ expands reversibly and adiabatically from $1.25 \mathrm{~dm}^3$ to $2.50 \mathrm{~dm}^3.$ Calculate the enthalpy change in this process. $\mathrm{C}_{\mathrm{v}, \mathrm{m}}$ for argon is $12.48 \mathrm{~JK}^{-1} \mathrm{~mol}^{-1}$

NEET UG CHEMISTRY MCQ: THERMODYNAMICS

1 Hard

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Application +4 | -1

A sample of argon gas at

1 \mathrm{~atm}

pressure and

27^{\circ} \mathrm{C}

expands reversibly and adiabatically from

1.25 \mathrm{~dm}^3

2.50 \mathrm{~dm}^3.

Calculate the enthalpy change in this process.

\mathrm{C}_{\mathrm{v}, \mathrm{m}}

for argon is

12.48 \mathrm{~JK}^{-1} \mathrm{~mol}^{-1}

View answer and explanation

Correct option: A

-116 \text{ J}

Option A (-116 J) is correct because it is the enthalpy change calculated using the adiabatic process equation and the given heat capacity.

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