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The mole is best described as

  • A.a fixed number of entities, used as a counting unit
  • B.a unit of mass equal to the molar mass of the substance
  • C.a unit of volume measured at standard conditions
  • D.a measure of the concentration of a solution

Answer: A

It counts molecules rather than weighing them, which is why stoichiometry works in moles. The molar mass and the molar volume are properties that connect the count to mass and volume respectively. Avogadro's number fixes how many entities a mole contains.

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