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Questions and Answers
Which of the following is the definition of a mole in chemistry?
Which of the following is the definition of a mole in chemistry?
- A unit used to measure the amount of a substance (correct)
- A measurement of temperature
- A type of chemical reaction
- A small animal that burrows underground
What is Avogadro's number?
What is Avogadro's number?
- The number of atoms in one molecule of a substance
- The number of moles in one gram of a substance
- The number of particles in one mole of any substance (correct)
- The number of particles in one gram of carbon-12
What is the molar mass of a substance?
What is the molar mass of a substance?
- The mass of one particle of that substance
- The mass of one atom of that substance
- The mass of one ion of that substance
- The mass of one mole of that substance (correct)
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Study Notes
Molecular Chemistry Basics
- A mole (mol) is a unit of measurement in chemistry that represents 6.022140857 × 10^23 particles, such as atoms, molecules, or ions.
- Avogadro's number is a constant that represents the number of particles in one mole, equal to 6.022140857 × 10^23 particles.
- The molar mass of a substance is the mass of one mole of the substance, typically expressed in units of grams per mole (g/mol).
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