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JEE Main levelSingle correct optionDifficulty 2 of 3mc081

A aqueous solution of () has density . Its molality is closest to

  1. A
  2. B
  3. C
  4. D

Answer: B

1 L of solution weighs 1080 g and contains 2 x 58.5 = 117 g of , so water = 963 g. Molality = 2.00/0.963 = 2.08 mol/kg.
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More questions on Concentration terms (molarity, molality, mole fraction, ppm) and dilution