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When a composition is quoted without stating its basis, the safest assumption is

  • A.that it is always by mole
  • B.that it must be clarified before use
  • C.that it is by mole for gases and by mass for liquids
  • D.that it is always by mass

Answer: B

Conventions differ between industries and a wrong assumption propagates silently through every subsequent step. Asking is cheaper than repeating the calculation, and the second option, though a common convention, is not universal.

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