For the free expansion of a gas,which of the | vedclass

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(A) Free expansion is an adiabatic process where a gas expands into a vacuum. Since the gas expands against zero external pressure $(P_{ext} = 0)$,the

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$Q = 0, W = 0$ and $\Delta U = 0$

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(A) Free expansion is an adiabatic process where a gas expands into a vacuum. Since the gas expands against zero external pressure $(P_{ext} = 0)$,the work done is $W = P_{ext} \Delta V = 0$. Because the process is adiabatic and occurs in an isolated system,no heat is exchanged with the surroundings,so $Q = 0$. According to the first law of thermodynamics,$\Delta U = Q - W$. Substituting the values,$\Delta U = 0 - 0 = 0$. Therefore,for free expansion,$Q = 0, W = 0$ and $\Delta U = 0$.

For the free expansion of a gas,which of the following is true?

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