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A gas is allowed to expand at constant t...

A gas is allowed to expand at constant temperature from a volume of `1.0 L` to `10.0 L` against an external pressure of `0.50` atm. If the gas absorbs `250 J` of heat from the surroundings, what are the values of `q` and `DeltaE` ? (Given `1 L "atm" =101 J`)

A

`"+250 J -455 J -205 J"`

B

`"-250J -455J -710 J"`

C

`"+250 J +455J +710 J"`

D

`"-250 J +455 J +205 J"`

Text Solution

Verified by Experts

`V_(1)=1` litre, `V_(2) = 10` litre
`P_("ext")=0.50 atm, q=250 J`
`W=-P_("ext")xx Delta V=-P_("ext")xx(V_(2)-V_(1))=-0.5 (10-1)xx101=-455 J`
`Delta E = q + W = 250-455 =-205 J`
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