A commercial grade aqueous HCl solution is 37.0% (by mass) HCl and has a density of 1.18 g/mL. What is the molality of the HCl solution?

Molality is 16.1 m

Explanation:

37 % by mass indicates that 37 g of HCl, our solute, is contained in 100 g of solution. Let's determine the mass of solvent.

Mass of solution = Mass of solute + Mass of solvent

100 g = 37 g + Mass of solvent

Mass of solvent is 63 g

Let's convert the mass to kg → 63 g . 1kg / 1000 g = 0.063kg  for molality

Let's convert the mass of solute to moles → 37 g . 1 mol / 36.45 g = 1.01 moles of solute

Molality → mol/kg = 1.01 mol / 0.063 kg → 16.1 m

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.

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