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JEE Main 20246 AprilEvening Shift
Exam
JEE Main
Year
2024
Date
6 April
Shift
Evening Shift
Subject
Chemistry
Chapter
Some Basic Concepts of Chemistry

JEE Main 2024 · 6 April · Evening Shift · Chemistry · Some Basic Concepts of Chemistry

Molality ( ( m ) ) of (3 M ) aqueous solution of ( NaCl ) is :...

Molality ( (m\mathrm{m}) ) of (3 M\mathrm{M}) aqueous solution of (NaCl\mathrm{NaCl}) is : (Given : Density of solution (=1.25  g mL−1\mathrm{~g} \mathrm{~mL}^{-1}), Molar mass in (gmol−1\mathrm{g} \mathrm{mol}^{-1}: Na−\mathrm{Na}-23, Cl−\mathrm{Cl}-35.5))

Options

  1. A(1.9 \mathrm{~m})
  2. B(3.85 \mathrm{~m})
  3. C(2.79 \mathrm{~m})
  4. D(2.90 \mathrm{~m})

Correct answer

C. (2.79 \mathrm{~m})

Step-by-step solution

3 moles are present in 1 litre solution molality =3×10001.25×1000−[3×58.5]=2.79\text{molality }=\frac{3 \times 1000}{1.25 \times 1000-[3 \times 58.5]}=2.79m\mathrm{ m}
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