SUMMARY
The calculation of DeltaE for a gas expansion process involves the gas absorbing 42J of heat and performing 14J of work on the surroundings. The correct formula used is DeltaH = DeltaE - Q, leading to the equation 42 = DeltaE - 14. This results in DeltaE being calculated as +28J. A common misconception arises with the alternative calculation suggesting DeltaE = 42 + 14, which is incorrect.
PREREQUISITES
- Understanding of thermodynamic principles, specifically the first law of thermodynamics.
- Familiarity with the concepts of heat transfer and work in thermodynamic processes.
- Knowledge of the relationship between DeltaE, DeltaH, and heat (Q).
- Basic algebra skills for solving equations.
NEXT STEPS
- Study the first law of thermodynamics in detail.
- Learn about the differences between internal energy (DeltaE) and enthalpy (DeltaH).
- Explore examples of gas expansion work calculations in thermodynamics.
- Review common mistakes in thermodynamic calculations to avoid misconceptions.
USEFUL FOR
Chemistry students, educators, and anyone studying thermodynamics or preparing for chemistry exams will benefit from this discussion.