What fraction or percentage of carbon atoms has a mass of 12.011 amu?

Zero fraction or percentage of carbon atom has a mass 12.011 amu.

Due to isotopes of carbon, no carbon atom has the mass 12.011 amu. This mass is not the exact mass, but it is the average mass of carbon atoms. Since, the weight of isotopes is different thus, the atomic weight of the carbon in periodic table is written by taking average of atomic weight of isotopes of carbon atoms by also considering their abundance.

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .