I need help calculating mol fractions and other aspects of isotopes. The attached questions are samples of what have been on past exams and I would

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I need help calculating mol fractions and other aspects of isotopes. The attached questions are samples of what have been on past exams and I would really appreciate help with them. Thank you and please show as much detail as possible!!

  • Attachment 1
  • Attachment 2
  • Attachment 3

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