Calculate the mass in grams of 3.94×1024 molecules of formaldehyde. the chemical formula for formaldehyde is ch2o.

Mass in grams of formaldehyde = 196.51 g

Explanation:

No. of molecules of formaldehyde =

Moles is related with number of molecules as:

Avogadro's no. =

moles of formaldehyde

Molar mass of formaldehyde = 30.03 g/mol

Molar mass is related with mass as:

Mass = Moles × Molar mass

        = 6.544 × 30.03

       = 196.51 g

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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 .