By definition, a mole specifies 6.022xx10^236.022×1023 individual particles of stuff. And we use this number because 6.022xx10^236.022×1023 individual ""^1H1H atoms have a mass of 1.00*g1.00⋅g precisely. The mole is thus the link between the micro world of atoms and molecules to the macro world of grams, and litres.
Here we gots a 0.52*mol0.52⋅mol quantity of C_2H_6OC2H6O...we gots 0.52*molxx6.022xx10^23*mol^-10.52⋅mol×6.022×1023⋅mol−1 "oxygen atoms"oxygen atoms,
2xx0.52*molxx6.022xx10^23*mol^-12×0.52⋅mol×6.022×1023⋅mol−1 "carbon atoms"carbon atoms, and 6xx0.52*molxx6.022xx10^23*mol^-16×0.52⋅mol×6.022×1023⋅mol−1 "hydrogen atoms"hydrogen atoms.
Note that here we use the mole precisely as we would use other collective numbers, i.e. "dozen"dozen, "score"score, "gross"gross. How do find the masses of each of the elemental quantities?