The Concept of Mole in Chemistry
Which statement best describes a mole?
It contains 6.02 x 10^23 particles of a given substance. A mole is simply a unit of measurement. Units are invented when existing units are inadequate. Chemical reactions often take place at levels where using grams wouldn't make sense, yet using absolute numbers of atoms/molecules/ions would be confusing.
Answer: The correct option is, It contains 6.02 x 10^23 particles of a given substance.
Explanation:
According to the mole concept, one mole of a substance contains 6.02 x 10^23 number of particles of a given substance.
For example:
1 mole of oxygen (O) contains 6.02 x 10^23 number of oxygen atoms
1 mole of oxygen (O2) contains 2 x 6.02 x 10^23 number of oxygen atoms
Hence, the correct option is, It contains 6.02 x 10^23 particles of a given substance.