Calculation of Work Done in Various Thermodynamic Processes

IMPORTANT

Calculation of Work Done in Various Thermodynamic Processes: Overview

This topic covers concepts, such as, Work Done in Reversible Adiabatic Process, Graph of Isochoric Process, Reversible Adiabatic Vs Reversible Isothermal for Ideal Gases & Reversible Adiabatic Vs Irreversible Adiabatic for Ideal Gases etc.

Important Questions on Calculation of Work Done in Various Thermodynamic Processes

MEDIUM
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During isothermal expansion of an ideal gas, its

                               

MEDIUM
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3 moles of an ideal gas expands isothermally against a constant pressure of 2 Pascal from 20 L to 60 L.The amount of work involved is

MEDIUM
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Two moles of He gas (γ=5/3) are initially at temp 27°C and occupy a volume of 20 litres. The gas is first expanded at constant pressure until its volume is doubled. Then it undergoes reversible adiabatic change, until the volume become 110 lit, then predict the value of T/100 (where T is the final temperature, 4112/3=12)

MEDIUM
IMPORTANT

The magnitude of reversible work done by an ideal gas in four different processes: isothermal expansion, adiabatic expansion, constant pressure expansion, and free expansion are Wi, Wa, Wp, and Wf respectively. Choose the right order of sequence for the magnitude of the work done. (Change in the volume is same for all the processes.)

EASY
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An ideal gas undergoes isothermal expansion at constant pressure. During the process:

EASY
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A gas absorbs 58.63 joules of heat, when the gas expands from 2 litre at STP to 2.5 litre at 1 atm.  Calculate the Change in its internal energy in joules is

(Round off the answer up to three significant figures)

HARD
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q, w, ΔE and ΔH for the following process ABCD for a monoatomic gas are:

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HARD
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Consider the reversible isothermal expansion of an ideal gas in a closed system at two different temperatures T1 and T2 T1<T2. The correct graphical depiction of the dependence of work done w on the final volume v.

MEDIUM
IMPORTANT

Five moles of an ideal gas at 293 K is expanded isothermally from an initial pressure of 2.1 M Pa to 1.3 M Pa against at constant external 4.3 M Pa. The heat transferred in this process in  kJ mol-1 is (Rounded-off of the nearest integer) [Use R=8.314 J mol-1 K-1]

MEDIUM
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The magnitude of word done by a gas that undergoes a reversible expansion along the path ABC shown in the figure is___________Nm.

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HARD
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During the free expansion of an ideal gas in an isolated chamber,
 

EASY
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2 mole of an ideal gas at 27°C expands isothermally and reversibly from a volume of 4 litre to 40  litre. The work done (in Joule) by the gas is (R=8 J/mol K; ln 10=2.3)

EASY
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The process in which an ideal gas undergoes change from X to Y as shown in following diagram is:

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HARD
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A certain quantity of an ideal gas is expanded from 20 L to 60 L isothermally in three steps. The pressure of these three states are 1.5 atm,1.2 atm and 1 atm respectively. Now, the gas is brought back to the initial state by the given three steps again. Calculate the total work done on the system during this cycle in J. (Take : 1 atm-L=100 J)

EASY
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An ideal gas is taken around the cycle ABCA as

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The work done in the cyclic process is:

MEDIUM
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16 g oxygen gas expands at STP, to occupy double of its original volume. The work done during the process is:

EASY
IMPORTANT

For an isothermal process for an ideal gas, ΔU is equal to: