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9th Class Science Atoms and Molecules Question Bank 9th CBSE Science Atoms and Molecules

  • question_answer
      Ravi prepared a solution of sodium chloride by mixing 5.85 g of salt in 1 litre of water. Find (a) molar mass of sodium chloride. (b) number of moles of sodium chloride dissolved. (Atomic masses of sodium and chlorine are23 u and 35.5 u respectively). (c) Concentration of the sodium chloride Solution.

    Answer:

       (a) Molar mass of sodium chloride (NaCI) = atomic mass of sodium (Na) + atomic mass of chlorine (Cl) = 23 + 35.5 u= 58.5 u= 58.5 g        (b) Number or moles (c) Concentration of solution  ( Density of water is taken 1000 g/L)


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