You can practice converting between the mass of a solution and mass of solute when the mass percent concentration of a solution is known. The concentration of the KCN solution given in Part A corresponds to a mass percent of 0.480 %. What mass of a 0.480 % KCN solution contains 697 mg of KCN? Express the mass to three significant figures and include the appropriate units. View Available Hint(s)

Question

contestada

Respuesta :

Tringa0 Tringa0 · Answer 1 · 2019-11-07T09:21:39+01:00

Answer:

145 grams of a 0.480 % KCN solution contains 697 mg of KCN.

Explanation:

w/w % : The percentage mass or fraction is mass of the of solute present in 100 grams of the solution.

[tex]w/w\%=\frac{\text{Mass of solute}}{\text{Mass of solution}}\times 100[/tex]

given = w/w% = 0.480 %

Mass of solute that KCN = 697 mg = 0.697 g

(1 mg = 0.001 g)

Mass of the solution = ? = x

[tex]0.480\%=\frac{0.697 g}{x}\times 100[/tex]

[tex]x=\frac{0.697 g}{0.480}\times 100[/tex]

x = 145.21 g ≈ 145 g

145 grams of a 0.480 % KCN solution contains 697 mg of KCN.