Discussion
Consider the following statements about converting between mole and mass fractions.
1. The conversion requires the molar mass of every component.
2. Mole and mass fractions coincide when all molar masses are equal.
3. The conversion is a simple multiplication by a single factor.
Answer: A
The first two are correct. The third is wrong because each component is weighted by its own molar mass and the result renormalised, so no single factor can do the job for the whole stream. The molar masses enter individually rather than as an average.
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