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Questions and Answers
Which of the following statements about the mole concept is true?
Which of the following statements about the mole concept is true?
- The mole concept is a way to count atoms and molecules
- The mole concept is based on Avogadro's number (correct)
- The mole concept is only applicable to gases
- The mole concept is used to measure temperature
What is the relationship between the mass of a substance and the number of moles?
What is the relationship between the mass of a substance and the number of moles?
- The mass of a substance is directly proportional to the number of moles (correct)
- The mass of a substance is inversely proportional to the number of moles
- The mass of a substance is unrelated to the number of moles
- The mass of a substance is equal to the number of moles
What is the molar mass of water (H2O)?
What is the molar mass of water (H2O)?
- 18 g/mol (correct)
- 22 g/mol
- 20 g/mol
- 24 g/mol
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Study Notes
Mole Concept
- The mole (mol) is a unit that relates the mass of a substance to the number of particles it contains.
- The relationship between the mass of a substance and the number of moles is that one mole of a substance has a mass equal to its molar mass expressed in grams.
Molar Mass of Water
- The molar mass of water (H2O) is 18.0153 g/mol, which is the sum of the atomic masses of two hydrogen atoms (1.00794 g/mol each) and one oxygen atom (15.9994 g/mol).
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