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

For an ideal gas expanding adiabatically in vacuum,A. `Delta H lt 0`B.

1.	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
Answer» Correct Answer - 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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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

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