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    Chemistry
    Grade-9
    Easy

    Question

    Naturally occurring chlorine is 75% Cl35 which has an atomic mass of 35 amu and 25% Cl37 which has a mass of 37 amu. Calculate the average atomic mass of chlorine:

    1. 37
    2. 35
    3. 35.5
    4. All the above

    hintHint:

    Average atomic mass is the average of both.

    The correct answer is: 35.5

      Naturally occurring chlorine is 75% Cl35 whose atomic mass is 35 amu and 25% Cl37 has a mass of 37 amu.
      The average atomic mass of chlorine = 0.75cross times35 + 0.25cross times37 = 35.5 amu.

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