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Questions and Answers
What is the numerical value of the Avogadro constant (symbol NA) expressed in mol-1?
What is the numerical value of the Avogadro constant (symbol NA) expressed in mol-1?
- 3.14159
- 9.80665
- 6.67430×10^-11
- 6.02214076×10^23 (correct)
What is the historical basis for the definition of the mole?
What is the historical basis for the definition of the mole?
- The number of particles in a milliliter of air
- The mass of a single carbon atom
- The amount of substance that corresponds to the number of atoms in 12 grams of 12C (correct)
- The number of molecules in 1 gram of water
What does one mole contain?
What does one mole contain?
- 1000 milliliters of a liquid
- 6.02214076×10^23 elementary entities (correct)
- 12 grams of any substance
- A specific number of molecules for each substance
How was the mass of a mole of a compound historically related to the average molecular mass of the compound?
How was the mass of a mole of a compound historically related to the average molecular mass of the compound?
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What is the Avogadro number (symbol N0) representative of?
What is the Avogadro number (symbol N0) representative of?
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Study Notes
Avogadro Constant
- The Avogadro constant (symbol NA) is expressed in mol-1 and has a numerical value of 6.02214076 × 10^23.
Definition of the Mole
- The historical basis for the definition of the mole is rooted in the amount of a substance that contains as many particles as there are atoms in 0.012 kilograms of carbon-12.
One Mole
- One mole contains 6.02214076 × 10^23 particles, which can be atoms, molecules, ions, or electrons.
Mass of a Mole
- Historically, the mass of a mole of a compound was related to the average molecular mass of the compound, where the mass of a mole of a substance is equal to its average molecular mass expressed in grams.
Avogadro Number
- The Avogadro number (symbol N0) is representative of the number of particles (atoms, molecules, ions, or electrons) in one mole of a substance, which is equal to 6.02214076 × 10^23.
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