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In a system, a piston caused an external...

In a system, a piston caused an external pressure of `1.25` bar giving a change in volume of `32 L` for which, `Delta E=-51J`. What was the value of heat involved`:`

A

`-55kJ`

B

`-11kJ`

C

`-47kJ`

D

`-91kJ`

Text Solution

Verified by Experts

The correct Answer is:
3
`W=-P_(cx i)DeltaV`
`W=-1.25xx32=-40` lt bar`=-40xx100J=-4000J=4kJ`
`DeltaE=q+w`
So, `" "q=DeltaE-w=-51+4=-47kJ`
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