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26 January, 17:12

A sample of a solid labeled as NaCl may be impure. a student analyzes the sample and determines that it contains 75 percent chlorine by mass. Pure NaCl contains 61 percent chlorine by mass. which of the following statements is consistent with the data?

a - the sample contains only NaCl

b - the sample contains NaCl and NaI

c - the sample contains NaCl and KCl

d - the sample contains NaCl and LiCl

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Answers (1)
  1. 26 January, 18:04
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    D

    Explanation:

    The sample must contain impurity that is lower in atomic mass to sodium and since potassium has higher atomic mass to sodium, the answer is the sample contains NaCl and LiCl. We are sure already that the sample is not pure which rules out option a and option b contains sodium iodide which cannot contribute to the increase in chlorine
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