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9th Class Science Sample Paper Sample Paper - 5 Term - 1

  • question_answer
      Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water?

    Answer:

      Mass % of sodium sulphate solution = 20% Mass of the solvent = 100 g Let the mass of solute (sodium sulphate) Applying the formula,                                                                                                                               (1/2)                                                                                                                                                                     (1)                                                                                                                                                                         (1/2) Mass of sodium sulphate = 25 g                                                                                                                                                 (1)


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