What is the molality of 150.0 g of nh3 dissolved in a solution that is 1.25 liters? the density of the solution is 1.45 g/ml.

The correct answer is 4,87 mol/kg.

Explanation:

The molality of a compound is the relationship between the number of moles of solute in a kilogram of solvent.

First, we must calculate the number of moles of present in the 150 g.

: Molar mass of

n: number of moles of

m: total mass of the sample

n =

n =

n=8,82 mol

Now we must calculate the amount of solution we have, using the volume they give us data and density:

M: Mass of the solution.

V: Volume of the solution.

d: Density of the solution.

M = V * d

M = 1250 mL * 1.45

M = 1812,5 g = 1,8125 kg

With these two data, we can calculate the molality of as:

=

= 4,87

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