Answer: The molar mass (mass in grams of a substance) is the sum of the masses of the constituent components of a substance, excluding their molar volumes (also known as volumetric weights).

To calculate the molar mass, we first need to know the molar volumes (sometimes called volumetric weights) of each component in the mixture, then we take the total masses of all the components in the mixture and add them together.

In the case of ethanol, the molar mass is given as 6.519*0.73187×1025 grams.

This means that the mass of one mol of ethanol in water is 6.519*0.73187*1025 grams, so by dividing 6.519*0.73187 by the total mass of all the components in the mixture, we get an approximation of the molar mass.

Example:

Molar mass of H2​O = 2× atomic mass of hydrogen + 1× atomic mass of oxygen

= 2×1 +1×16

= 18 g/mol

So Molar mass of H2O is 18grams/mol