Final answer:
All the options provided (12.01 g of Carbon, 6.022 x 10²³ atoms of Carbon, 1.008 g of Hydrogen) represent different ways to describe a mole, which is a fundamental concept in chemistry representing Avogadro's number of particles in a substance.
Therefore, the answer is D.
Step-by-step explanation:
The question asks which of the options equal a mole. A mole is a unit of measurement in chemistry that refers to the amount of any substance containing as many particles, atoms, molecules, ions, or other elementary units as there are atoms in 12 grams of carbon-12. This is Avogadro's number, which is approximately 6.022 x 10²³.
- Option A, which states 12.01 g of Carbon, is an approximation close enough to the exact definition of a mole, referring to the fact that one mole of the carbon-12 isotope has a mass of exactly 12 g.
- Option B explicitly states Avogadro's number of particles, which defines a mole regardless of the element or compound.
- Option C, however, specifies 1.008 g of Hydrogen, which represents one mole of hydrogen because the atomic mass of hydrogen is approximately 1.008 g/mol.
Therefore, the answer is D. All of the options equal a mole.