Respuesta :

kenmyna
The  mass %  of  a solution  prepared  by   dissolving 18.9  grams  of  an unknown  solid into  39.5 grams of water is  calculated as  below


%(M/M) =  mass of the solute(unknown  salt)/ mass of the solvent(water)  x 100

 = 18.9 g/ 39.5 g x100  =47.85% (M/M)
dsdrajlin

Answer:

32.4%

Explanation:

Step 1: Given data

Mass of the solute = 18.9 g

Mass of the solvent = 39.5 g

Mass of the solution = Mass of the solute + Mass of the solvent = 58.4 g

Step 2: Calculate the mass percent of the solute in the solution

We use the following expression.

[tex]\% m/m =\frac{mass\ of\ the\ solute}{mass\ of\ the\ solution} \times 100\%=\frac{18.9g}{58.4g} \times 100\% =32.4\%[/tex]

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