Question

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Answer 1

Answer:

7.89 %

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Explanation:

Answer 2

Answer:

16.15% option3

Explanation:

20% of ethanol = 20 ml if ethanol in 100 ml of sol.

mass = v *d

         =   20(ml) *0.789 = 15.78g

mass of solution =   100*0.977 = 97.7g

mass% =   15.78/97.7*100 = 16.15%