If ethanol dissolves in water, then which of the following would be done

Options

A. Absorption of heat and contraction in volume
B. Emission of heat and contraction in volume
C. Absorption of heat and increase in volume
D. Emission of heat and increase in volume

Answer

B

Explanation

There is strong hydrogen bonding between water molecules and ethanol molecules. The H - bonds pack the molecules together in the liquid phase, which produces slight increase in density and total volume reduction. Also, the strong interaction implies a reduction in the internal energy of the system which manifests as the liberation of energy in the form of heat.