If there are 12 x 10^23 oxygens in a sample of water, how many grams of hydrogen are in the sample?

This can be solved by understanding of Avogadro's number and mole relationship concept.

A molecule of water have the chemical formula as HO. This implies that for every 1 atom or molecule of oxygen, 2 hydrogen must be present.

In the question given, we have atoms of oxygen. This implies we must have

Avogadro's number is proportionality that relates the number of particles to the amount of substance in that sample and it is given as

Now, let's compare this molar mass - Avogadro's number

molar mass of hydrogen = 1g/mol

from the calculation above, we would have 3.98g of hydrogen present in that particles of oxygen

learn more on avogadro's concept

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.