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14 March, 19:26

the mass of element Q found in 1.00 mole of each of four compounds is 38.0 grams, 57.0 grams, 76.0 grams and 114 grams.

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  1. 14 March, 19:34
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    Missing question: A possible atomic weight of Q is?

    A) 12.7.

    B) 19.0.

    C) 27.5

    D) 38.0

    E) 57.0.

    Answer is: possible atomic weight of Q is B) 19.0.

    Molecular weight of first molecule is 38.0 g/mol.

    Molecular weight of second molecule is 57.0 g/mol.

    Molecular weight of third molecule is 76.0 g/mol.

    Molecular weight of fourth molecule is 114.0 g/mol.

    All four molecular weights can be division only by 19 to get whole number:

    Molecule 1 (38 : 19 = 2), molecule 2 (57 : 19 = 3), molecule 3 (76 : 19 = 4) and molecule 4 (114 : 19 = 6).

    Molecular formulas are than Q₂, Q₃, Q₄ and Q₆.
  2. 14 March, 19:46
    0
    The question; The mass of element Q found in 1.00 mole of each of four different compounds is 38.0 grams, 57.0 grams, 76.0 grams, and 114 grams, respectively. A possible atomic weight of Q is;

    Answer;

    Atomic weight of Q = 19 g

    Solution and explanation;

    A possible atomic mass of Q has to be a factor of 38, 57, 76, and 114.

    Because the number of atoms of Q in any compound must be a whole number.

    -Finding a greatest common Divider of 38, 57, 76, and 114

    38 = 2 (19)

    57 = 3 (19)

    76 = 4 (19)

    114 = 6 (19)

    Thus; the greatest common divider is 19

    Hence, the possible atomic mass of Q is 19 g
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