Discussion
Arrange the steps of converting a mass per cent analysis to mole per cent.
1. total the moles obtained
2. take one hundred kilograms as the basis
3. divide each component by that total
4. divide each component mass by its molar mass
Answer: B
Choosing the basis first turns the percentages into masses, and the division by molar mass converts each to moles. Renormalising at the end is what makes the figures percentages again. The same four steps run in reverse for the other direction.
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