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NEET CHEMISTRYSome Basic Concepts of ChemistryMedium

Question

Find the molarity of liquid HCl if the density of liquid HCl is 1.17 g/cc1.17\text{ g/cc}.

A

36.5

B

18.25

C

32.05

D

42.1

Step-by-Step Solution

  1. Identify the Definition: Molarity (MM) is defined as the number of moles of solute dissolved in one litre of solution .
  2. Assumption: Consider exactly 1 Litre1\text{ Litre} (1000 cc1000\text{ cc} or 1000 mL1000\text{ mL}) of the liquid HCl.
  3. Calculate Mass: Using the given density (d=1.17 g/ccd = 1.17\text{ g/cc}): Mass=Density×Volume=1.17 g/cc×1000 cc=1170 g\text{Mass} = \text{Density} \times \text{Volume} = 1.17\text{ g/cc} \times 1000\text{ cc} = 1170\text{ g}
  4. Calculate Moles: The molar mass of HCl (1+35.51 + 35.5) is 36.5 g/mol36.5\text{ g/mol}. Moles(n)=MassMolar Mass=117036.532.05 mol\text{Moles} (n) = \frac{\text{Mass}}{\text{Molar Mass}} = \frac{1170}{36.5} \approx 32.05\text{ mol}
  5. Calculate Molarity: M=nV(in L)=32.05 mol1 L=32.05 MM = \frac{n}{V(\text{in L})} = \frac{32.05\text{ mol}}{1\text{ L}} = 32.05\text{ M}

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Some Basic Concepts of Chemistry. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYSome Basic Concepts of Chemistrymolarityliquiddensityliquid

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