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

  • question_answer
      The mass of one steel screw is 4.11 g. (a) Find the mass of one mole of these steel screws. (b) Compare this value with the mass of the Earth . Which one of the two is heavier and by how many times?

    Answer:

       (a) 1 mole =6.022 x1023 particles Mass of 1 mole (6.022 x1023) screws =6.022x1023 x 4.11g                             (b)        Ratio = mass of 1 mole screw : mass of Earth = 1 : 2410                       Mass of Earth is heavier by 2410 times than Hence, mass of one steel screw.  


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