# 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) $-0.9$

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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