Question

Mass of ethanol to be added to 1.0 kg water to have the mole fraction equal to 0.20​

Answer 1

Answer:

Thus, approximately 638.825 g of Ethanol must be added to make its mole fraction 0.2.

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Answer 2

Answer:

638.89

Explanation:

mass of ethanol added =>

 0.2=m/46gmol−1)(m/46gmol−1)+(1000g/18gmol−1)

                                ⇒m46g=0.2×100018×10.8

                               =13.89

                          m=13.89×46g=638.89g

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