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

  • question_answer
      Define the term mole. Calculate the number of moles in (a) 3.011 x 1023 atoms of C (b) 32 g of oxygen gas [atomic mass of 0 = 16 u and C = 12 u]   

    Answer:

         Mole It refers to the amount of a substance which contains as many particles (atoms, ions or molecules) as in 12g of C-12.                           (a)  6.022 x 1023 atoms of C = 1 mol 3.011 x 1023 atoms of C (b) 32 g of  gas =1 mol  


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