Consider a system consisting of the following apparatus, in which gas is confined in one flask and there is a vacuum in the other flask. The flasks are separated by a valve that, when opened, connects the two flasks. Assume that the flasks are perfectly insulated and will not allow the flow of heat into or out of the flasks to the surroundings.
(a) When the valve is opened, gas flows from the filled flask to the evacuated one. Does that surprise you?
(b) Is work performed during the expansion of the gas? Why or why not?
(c) Can you determine the value of ΔE for the process? Does the answer surprise you? (We will talk about this system more in Chapter 19.)

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1 atm Evacuated