Taking into account the definition of molar mass and Avogadro's number, the correct answer is option B. 26.00 g Fe does not represent 1.000 mol of the indicated substance.
On one side, Molar mass is the amount of mass that a substance contains in one mole.
On the other hand, the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance is called Avogadro's Number or Avogadro's Constant. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Then, being the molar mass of Fe 55.847 [tex]\frac{g}{mole}[/tex], the correct answer is option B. 26.00 g Fe does not represent 1.000 mol of the indicated substance.
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