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12 November, 20:14

Which of the following samples has the greatest mass?

A) 1.4 mol Na

B) 1.02 _ 1024 atoms Na

C) 23 g Na

D) 6.02 _ 1023 atoms Na

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Answers (1)
  1. 12 November, 20:37
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    Atomic mass of Na: 23 g = > 1 mol of Na = 23 g

    Analysis of each choice:

    A) 1. 4 mol = 1.4mol*23g/mol = 32.2 g

    B) 1 mol of atoms = 6.02 x 10^23 atoms = > 1.02 x 10^24 atoms / 6.02 x 10^23 atoms/mol = 1.69 mol

    1.69mol*23g/mol = 38.87 g

    C) 23 g

    D) 6.02 x 10 ^23 atoms = 1 mol = 23 g.

    Then the option B) is the right answer.
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