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Mass Spectroscopy of Elements

AP Chemistry· difficulty 3/5

Chlorine has two isotopes: ³⁵Cl (75%, mass 34.97) and ³⁷Cl (25%, mass 36.97). The atomic mass of Cl is approximately

  • A

    35.97

  • B

    35.45

    check_circle
  • C

    36.97

  • D

    34.97

Explanation

Mˉ=0.75×34.97+0.25×36.97=26.23+9.24=35.47\bar M = 0.75 \times 34.97 + 0.25 \times 36.97 = 26.23 + 9.24 = 35.47 ≈ 35.45 g/mol.

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