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. The gas in a piston (defined as the system) warms and absorbs 655 J of heat. The expansion performs 344 J of work on the surroundings. What is the change in internal energy for the system

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ajeigbeibraheem

The change in the internal energy for the system is 311 J

The change in internal energy for the system will be the difference between the heat absorbed and the work expansion from the surroundings.

i.e.

ΔU = Q + W

where;

  • internal energy = U
  • heat absorbed = Q
  • workdone on surroundings = -W

ΔU = ( 655 J + ( - 344 J) )

ΔU = 311 J

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