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

  • question_answer
      Calculate the formula mass of sodium carbonate

    Answer:

                      Formula mass of sodium carbonate = (2 x atomic mass of Na) + (1 x atomic mass of C) + (3 X atomic mass of O) + 10 [2 x atomic mass of H +1 x atomic mass of O] = 2 x 23 + 1 x 12 + 3 x 16+10[2 x 1 + x 16] = 46 + 12 + 48 +180 = 286 u


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