The density of an equal-mass water 1 ethanol mixture is 0.913 g/cc at 20°C. If the density of water is 0.998 g/cm3 and ethanol is 0.789 g/cm3 with both at 20°C, does this equal-mass mixture possess a positive or negative excess volume at 20°C?

Since water and ethanol have the same mass, there is an excess of positive volume at a temperature of 20°C

Explanation:

The component 1 refers to water and the component 2 refers to ethanol. The molar volume is

The excess volume is

Where xn are the mole fraction of water and ethanol, pm is the density of the mixture.

of the results, since water and ethanol have the same mass, there is an excess of positive volume at a temperature of 20°C

it would be a gas formation

the objects have the same charge.