The density of the resultant mixture is 0.925 g/cm³.
What is the mass of each component of the mixture?
The mass of each component of the mixture is calculated as follows;
m = ρV
where;
mass of water = 20 cm³ x 1 g/cm³ = 20 g
mass of ethanol = 20 cm³ x 0.789 g/cm³ = 15.78 g
Total mass of the mixture = 20 g + 15.78 g = 35.78 g
The density of the mixture is calculated as follows;
Density of the mixture = total mass / total volume
Density of the mixture = (35.78 g) / (38.7 cm³) = 0.925 g/cm³
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