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

  • question_answer
      Find out the ratio by mass of the combining element in the following compounds. (a)                                (b) (c)

    Answer:

       (a)  N =14 (mass number) H = 1 (mass number) Ratio by mass (N : H)= 14 : 1x3 = 14 : 3     (b) C = 12 (mass number) Cl = 35.5 (mass number) Ratio by mass (C : Cl) = 12 : 4 x 35.5 = 12 : 142 = 6 : 71     (c) Ca = 40 (mass number) C =12 (mass number) O=16 (mass number) Ratio by mass (Ca : C : O) = 40 : 12 : 16x 3 = 40 : 12 : 48 = 10 : 3 : 12


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