Multiple choice

The volume of ethyl alcohol (density $1.15\ {g}/{cc}$) that has to be added to prepare $100\ cc$ of $0.5\ M$ ethyl alcohol solution in water is :

  1. $1.15\ cc$
  2. $2\ cc$
  3. $2.15\ cc$
  4. $2.30\ cc$
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B Correct answer
AI explanation

To prepare 100 cc of a 0.5 M solution, you need 0.05 moles of ethyl alcohol, which has a molar mass of 46 g/mol. The required mass is found by multiplying the moles by the molar mass, yielding 2.3 g. The volume is determined by dividing this mass by the given density of 1.15 g/cc, resulting in a required volume of 2 cc.

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