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

  • question_answer
      Write the chemical formulae and calculate the molecular mass of the following. (a) Common salt               (b) Sodium carbonate (c) Caustic soda

    Answer:

          (a) Common salt = NaCI                 Molecular mass = Na + Cl = 23+35.5= 58.5 u       (b) Sodium carbonate Molecular mass  =2 x 23 + 12 + 3 x 16 = 106 u                (c) Caustic soda = NaOH               Molecular mass = Na + 0 + H = 23 + 16+1=40 u 


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