When helium gas is allowed to expand into vac | vedclass

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(C) The Joule-Thomson effect describes the temperature change of a real gas as it is forced through a valve or porous plug while kept insulated so tha

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The inversion temperature of helium is very low

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(C) The Joule-Thomson effect describes the temperature change of a real gas as it is forced through a valve or porous plug while kept insulated so that no heat is exchanged with the environment.For most gases, expansion results in cooling because work is done to overcome intermolecular forces.However, for gases like $H_2$ and $He$, the inversion temperature is very low (for $He$, it is approximately $40 \ K$).If the gas temperature is above its inversion temperature during expansion, it exhibits a heating effect instead of cooling.Since the inversion temperature of $He$ is very low, it shows a heating effect under standard conditions.

$Gas$	$a \ (atm \ L^2 \ mol^{-2})$	$b \ (L \ mol^{-1})$
$W$	$4.0$	$0.027$
$X$	$8.0$	$0.030$
$Y$	$6.0$	$0.032$
$Z$	$12.0$	$0.027$

When helium gas is allowed to expand into vacuum, a heating effect is observed. The reason for this is (assume $He$ as a non-ideal gas):

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