Answered

Which statement best describes a mole?

It is 12 units of a given substance.


It contains 6.02 mc001-1.jpg 1023 grams of sodium chloride.


It is the mass of 12 carbon atoms.


It contains 6.02 mc001-2.jpg 1023 particles of a given substance.

Verified Answer :

Kalahira

It contains 6.02mc001-2.jpg particles of a given substance is the answer. 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 \(6.02\times 10^{23}\) particles of a given substance.

Explanation :

According to the mole concept, one mole of a substance contains \(6.02\times 10^{23}\) number of particles of a given substance.

For example :

1 mole of oxygen (O) contains \(6.02\times 10^{23}\) number of oxygen atoms

1 mole of oxygen \((O_2)\) contains \(2\times 6.02\times 10^{23}\) number of oxygen atoms

Hence, the correct option is, It contains \(6.02\times 10^{23}\) particles of a given substance.

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