For the free expansion of a gas,which of the following is true?
- A$Q = 0, W = 0$ and $\Delta U = 0$
- B$Q = 0, W > 0$ and $\Delta U = -W$
- C$W = 0, Q > 0$ and $\Delta U = Q$
- D$W = 0, Q < 0$ and $\Delta U = 0$
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