**Assertion (A):** Pure water has a molarity of . <br>**Reason (R):** The density of water is . — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question

💡 Solution & Explanation

$\text{Molarity} = \text{moles in 1 L}$. Mass of $1 \text{ L}$ water $= 1000 \text{ g}$. $\text{moles} = 1000 / 18 \approx 55.55 \text{ mol}$. Thus $M = 55.5 \text{ M}$. The density provides the mass required for the calculation. [1]