What is the molality of a solution made by mixing 15 grams of Ba(OH)2 in 250 grams of water?

The answer to your question is molality = 0.35

Explanation:

Data

Molality = ?

mass of Ba(OH)₂ = 15 g

mass of water = 250 g

Process

1.- Calculate the molar mass of Ba(OH)₂

Ba(OH)₂ = 137 + 32 + 2 = 171 g

2.- Convert the mass to moles

                171 g 1 mol

                  15 g   x

                   x = (15 x 1) / 171

                   x = 15/171

                   x = 0.088 moles of Ba(OH)₂

3.- Calculate molality

Formula

molality = moles/mass of solvent (kg)

Substitution

molality = 0.088 / 0.250

Result

molality = 0.35

the millers tale is the answer.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.