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A tank is initially split into 2 equal parts by partition, and in 1 part there...

A tank is initially split into 2 equal parts by partition, and in 1 part there is steam and in the other part there is vacuum. Then we remove the partition and steam freely expands to fill up tank. What is the moving boundary work done by the steam during this process.

A) Negative, Because needs system work input to make up for heat loss

B) Postive, Because volume doubled

or

C) ZERO

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