Solved: CHEMISTRY Question for NEET

NEET CHEMISTRYMedium

Find the molarity of liquid HCl if the density of liquid HCl is $1.17\text{ g/cc}$ .

36.5

18.25

32.05

42.1

Identify the Definition: Molarity ( $M$ ) is defined as the number of moles of solute dissolved in one litre of solution .
Assumption: Consider exactly $1\text{ Litre}$ ( $1000\text{ cc}$ or $1000\text{ mL}$ ) of the liquid HCl.
Calculate Mass: Using the given density ( $d = 1.17\text{ g/cc}$ ): $\text{Mass} = \text{Density} \times \text{Volume} = 1.17\text{ g/cc} \times 1000\text{ cc} = 1170\text{ g}$
Calculate Moles: The molar mass of HCl ( $1 + 35.5$ ) is $36.5\text{ g/mol}$ . $\text{Moles} (n) = \frac{\text{Mass}}{\text{Molar Mass}} = \frac{1170}{36.5} \approx 32.05\text{ mol}$
Calculate Molarity: $M = \frac{n}{V(\text{in L})} = \frac{32.05\text{ mol}}{1\text{ L}} = 32.05\text{ M}$

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