Change in internal energy from given heat and work (first law)

1. A.
   $+50\text{ }J$
2. B.
   $-50\text{ }J$
3. C.
   $350\text{ }J$
4. D.
   $-350\text{ }J$

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1. A.
   18 J of the work is done by the gas ' A '.
2. B.
   2 J of the work is done by the gas ' A '.
3. C.
   12 J of the work is done on the gas 'A' by the surrounding.
4. D.
   14 J of the work is done on the gas ' A ' by the surrounding.

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