Discussion
Consider the following statements about heat capacity of gas mixtures.
1. The mixture value is the mole-fraction weighted sum of the components.
2. The rule assumes ideal gas behaviour with no heat of mixing.
3. The mixture value is the arithmetic mean of the component values.
Answer: D
The first two are correct. The third holds only when the mole fractions happen to be equal, and it is exactly the same weighting error that appears in computing an average molar mass. Mole fractions are the correct weighting throughout.
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