A gas absorbs 250 J of heat and expands ...

A gas absorbs `250 J` of heat and expands from `1` litre to `10` litres against the pressure `0.5` atmosphere at constant temperature. The values of `q`, `w` and `DeltaE` are respectively

A

250 J,455 J, 710 J

B

250 J, -455 J, -205 J

C

`+250 J, -455,-205 J`

D

`-250 J,455 J,-205 J`

Text Solution

Verified by Experts

The correct Answer is:

B

q=250J
`W=- P (V_2 -V_1) =- 0.5(10 -1)=- 4.5 atm`
`=- 4.5 xx 101. 3 J =- 455 J `
`Delta U = q + W = 250 -455 =- 250 J `

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