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A gas expands againts a constant externa...

A gas expands againts a constant external pressure of `2.00` atm, increasing its volume by `3.40L` . Simultaneously, the system absorbs `400J` of heat from its surroungs. What is `DeltaE` , in joules, for this gas?

A

`-689`

B

`-289`

C

`+400`

D

`+289`

Text Solution

Verified by Experts

The correct Answer is:
C
Given, `P=2.00` atm,
`DeltaV=3.4L`
`q=400J`
Work done by das `w=-PDeltaV`
`=-2xx3.4`
`=-6.8L` atm
`=-6.8xx101.32J`
`=-688.976J`
`DeltaE=q+(-w)`
`=400+(-688.976)`
`=-288.976~~-289J`
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