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The value of DeltaH for cooling 2 moles ...

The value of `DeltaH` for cooling 2 moles of an ideal monoatomic gas from `225^(@)C` to `125^(@)C` at constant pressure will be [given `C_(p)=(5)/(2)R`]

A

`250 R`

B

`-500R`

C

`500R`

D

`-250R`

Text Solution

Verified by Experts

The correct Answer is:
B
`DeltaH=nC_(p)DeltaT=2xx(5)/(2)R(125-225)`
`=-5R(100)=-500R`
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