2% solution by weight of sodium chloride solution is prepared. The molality of the solution is:
Correct answer: A. 0.34 molal
- A. 0.34 molal
- B. 0.25 molal
- C. 2 molals
- D. 0.02 mol
Explanation
2% solution by weight means 2 grams of NaCl is dissolved per 100 grams of water. No. of moles = given mass/ molar mass = 2/58.5= 0.034Molality = no of moles / mass of solution in kg= 0.034/0.1= 0.34 Molal
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Concentration units express the amount of solute in a given amount of solution or solvent. Calculations cover molarity, molality, normality, mole fraction, mass percentage, volume percentage, parts per million and dilution, including the effect of temperature on volume-based units and the distinction between molarity and molality.
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