The molality of a 1 M aqueous NaCl solution (density = 1.04 g/mL, NaCl…

Question

The molality of a 1 M aqueous NaCl solution (density = 1.04 g/mL, NaCl M = 58.5 g/mol) is closest to

Accepted Answer

A. {'text': '0.98 m', 'label': 'A'}

1. 1 L of 1 M NaCl contains 1 mol = 58.5 g of NaCl.
2. Mass of the solution = 1000 mL × 1.04 g/mL = 1040 g.
3. Mass of water = 1040 − 58.5 = 981.5 g = 0.9815 kg.
4. Molality = 1 / 0.9815 = 1.019 m ≈ 1.02 m.
_Source: NCERT Class 12 Chemistry, Unit 1 "Solutions", §1.2_

Answer

{'text': '1.02 m', 'label': 'B'}

Answer

{'text': '1.10 m', 'label': 'C'}

Answer

{'text': '0.94 m', 'label': 'D'}