Questions and Answers
Which of the following statements about the mole concept is true?
The mole concept is based on Avogadro's number
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
What is the molar mass of water (H2O)?
18 g/mol
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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