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COMEDK20269 May 2026Morning ShiftChemistrySolutionsActual

An aqueous solution of an unknown solute "X" is prepared by adding 4.0g of it into 2.0moles of water. What is the mass percent of "X" in the aqueous solution?

Options

  1. A40
  2. B20
  3. C10
  4. D15

Correct answer

C. 10

Step-by-step solution

Mass of solute X = 4.0 g Moles of water = 2.0 mol Molar mass of water = 18 g/mol Mass of water = 2.0 18 = 36.0 g Total mass of solution = 4.0 + 36.0 = 40.0 g Mass percent of X = ( 4.0 40.0 ) 100 = 10 Answer: 10

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