If a system loses 250 kJ of heat at the same time that it is doing 500 kJ of work on the surroundings, what is the change in the internal energy of the system?

Answer 1

-750 kJ

The heat gain by the system, #q = -250 "kJ"#. The work done on the system , #w = -500 "kJ"#.

According to the First Law of Thermodynamics,

#DeltaU=q+w#
#=-750 "kJ"#
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Answer 2

The change in internal energy is -250 kJ.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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