You have 15.5 g of oxalic acid, h2c2o4.what amount is represented by 15.5 g of oxalic acid? how many molecules of oxalic acid are in 15.5 g? how many atoms of carbon are in 15.5 g of oxalic acid?

a) m(H₂C₂O₄) = 15.5 g.

n(H₂C₂O₄) = m(H₂C₂O₄) ÷ M(H₂C₂O₄).

n(H₂C₂O₄) = 15.5 g ÷ 90 g/mol.

n(H₂C₂O₄) = 0.172 mol; amount of substance.

N(H₂C₂O₄) = n(H₂C₂O₄) · Na (Avogadro constant).

N(H₂C₂O₄) = 0.172 mol · 6.022·10²³ 1/mol.

N(H₂C₂O₄) = 1.037·10²³; number of molecules.

b) In one molecule of oxalic acid there are two atoms of carbon:

N(C) = 2 · N(H₂C₂O₄).

N(C) = 2 · 1.037·10²³.

N(C) = 2.074·10²³; number of carbon 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.

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