No individual atom in the sample of 1 mole of Neon has a mass of 20.18 a.m.u. Because it is:
Correct answer: D. The average atomic mass of Ne
- A. Overall mass of an isobar
- B. It is a fractional mass.
- C. It is molar mass of Ne
- D. The average atomic mass of Ne
Explanation
The atomic mass of an element like Neon (Ne) is typically expressed as an average atomic mass because neon exists as a mixture of isotopes, each with its mass. The atomic mass of 20.18 amu represents the weighted average of the masses of these isotopes, not the mass of a single atom.
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About Moles and Avogadro's Number
The mole connects the microscopic number of particles with measurable mass, using Avogadro's number, 6.022 × 10²³ particles per mole. Questions involve molar mass, conversion between mass, moles and particles, percentage composition, empirical and molecular formulas, and distinguishing atoms, molecules, ions and formula units.
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