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  2. Help me answer: An ideal gas is allowed to expand from 1L to 10L against a constant external pressure of 1 bar. The work done in KJ is :
# Engineering

An ideal gas is allowed to expand from 1L to 10L against a constant external pressure of 1 bar. The work done in KJ is :

  • Option 1)

    +10.0

  • Option 2)

    -9.0

  • Option 3)

    -2.0

  • Option 4)

    -0.9

 

Answers (1)
S solutionqc

 

Work (W) -

Any type of energy transfer between system & surrounding which is not due to temperature difference is known as work.

- wherein

It is considered as ordered form of energy.

 

 

 

First law of Thermodynamics -

Energy of universe is always conserved or total energy of an isolated system is always conserved

\Delta E= q + W


 

- wherein

\Delta E= Internal Energy

q= Heat

W= work

 

 

We know that,

W=-P_{ext}(v_{2}-v_{1})

=-1bar(10-1)

=-9bar-litre

\Rightarrow =-9\times 100J=-0.9KJ

\therefore option (4) is correct

 


Option 1)

+10.0

Option 2)

-9.0

Option 3)

-2.0

Option 4)

-0.9

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