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

  • question_answer
      A gold sample contains 90% of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold?

    Answer:

                      One gram of gold sample will contain of gold Number of moles of gold One mole of gold contains atoms = 6.022 X 1023 0.0046 mole of gold will contain = 0.0046 x 6.02,2 x 1023   = 2.77 X 1021


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