The activity of pure hydrogen gas at 1000°C and 5 atm pressure_________________?
Correct answer: D. Depends on the choice of the standard state
- A. Is always less than 1
- B. Is always greater than 1
- C. Can be 5
- D. Depends on the choice of the standard state
Explanation
Gas activity is defined relative to a chosen standard-state fugacity, commonly as a/f° or f/f°. Therefore, even for pure hydrogen at a specified pressure and temperature, its numerical activity depends on the selected standard state.
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