**Assertion (A):** of and of contain the same number of molecules.
**Reason (R):** A mole is the amount of substance that contains as many elementary entities as there are atoms in of carbon-12.

Question

**Assertion (A):** $1 ext{ mole}$ of $H_2O$ and $1 ext{ mole}$ of $CO_2$ contain the same number of molecules.
**Reason (R):** A mole is the amount of substance that contains as many elementary entities as there are atoms in $0.012 ext{ kg}$ of carbon-12.

Prashant Kotian · Accepted Answer

Correct answer: A. By definition, one mole of any substance contains Avogadro's number () of particles. Since both samples are , they contain exactly molecules. The reason is the formal SI definition of a mole. [1, 2]

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