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For an ideal gas expanding adiabatically...

For an ideal gas expanding adiabatically in vacuum,

A

`Delta H lt 0`

B

`Delta H = 0`

C

`Delta H gt 0`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
For an ideal gas expanding adiabatically, `Delta U = W` because `q = 0. W = - P Delta V = 0` because for expansion against vacuum, `P_("ext") = 0`.
According to thermodynamics,
`Delta H = Delta U + P Delta V`
Since both `Delta U` and `P Delta V` are zero, we have `Delta H = 0`.
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