Internal energy of an element at 1 atm and 25° C is ____________ kcal/kg.mole?
Correct answer: A. 0
- A. 0
- B. 273
- C. 25
- D. None of these
Explanation
Thermochemical tables conventionally assign zero standard internal energy of formation to an element in its standard state at 1 atm and 25°C. This is a reference-state value, since absolute internal energy itself is not directly measured.
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