How many molecules of H2 are present in 7.5 grams of H2? How many H atoms?

The answer is 2.258 x 10^24 molecules are presented in 7.5 grams of H2.

Explanation:

I am going to use the chart that I attached to answer this question.

To convert grams to molecules we need to divide by the molar mass and multiply by 6.02 x 10^23, which is the value of a mole.

In this case the molar mass is 2 because the molar mass of H is 1 and we need to multiply by 2 to get the molar mass of 2 hydrogens.

Molar Mass = 1 x 2 = 2

Then, we need to divide the grams that we have by 2 to covert grams into moles. Finally, to convert moles into molecules we need to multiply the moles by 6.02 x 10^23.

7.5 grams / 2 = 3.75 moles

(3.75 moles)(6.02 x 10^23) = 2.258 x 10^24 molecules

Molecules are equal to atoms, so 2.258 x 10^24 molecules = 2.258 x 10^24 atoms

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 .

the answer is 303.15 or 303