Question

A gas absorbs \( 100 \, \text{J} \) of heat while performing \( 40 \, \text{J} \) of work on its surroundings. Calculate the change in internal energy of the gas.

• A. \( 60 \, \text{J} \)
• B. \( 140 \, \text{J} \)
• C. \( 40 \, \text{J} \)
• D. \( 100 \, \text{J} \)

Hint:

When using the first law of thermodynamics, remember that work done by the system on the surroundings is considered positive, while heat absorbed by the system is also positive.