Multiple choice

Calculate the molarity of a 75% (w/w) solution of ethanol (C2H5OH) in water whose density is 0.8937 g mL−1?

  1. 7.3 mol L-1

  2. 14.6 mol L-1

  3. 21.9 mol L-1

  4. 29.2 mol L-1

  5. 36.5 mol L-1
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B Correct answer
Explanation

Correct answer.

Number of moles of ethanol in 670.3 g = 670.3 g/ 46 g mol-1 = 14.6 mol Molarity = Number of moles of solute / Volume of solution (in L) = 14.6 mol / 1 L = 14.6 mol L-1

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