Question

% p/v ejercicio ayúdenme por fa

Answer 1

% p/p = peso soluto  x  100

           `````````````````````````

           peso solución

p solc. = p soluto + p solvente

p soluto = x

sustituir:

5.48 g/g =     x           ·      100

                ``````````````````

                (x + p solvente)

5.48 g/g  · (x + 37.2 g) = 100 x

5.48 g/g x + 203.86 g = 100 x     (agrupar x)

100 x - 5.48 g/g x = 203.86 g

           94.52 g/g x = 203.86 g     (despejar x)

                  x = 203.86 g / 94.52 g/g

                  x = 2.16 g de soluto (CaCl2)

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% p/v = peso soluto  x  100

           `````````````````````````

             v solución

dH2O = 1 g/mL

1. calcular volumen de H2O

V = 37.2 g / 1 g/mL

v = 37.2 mL

V solc. = p soluto + V solvente

p soluto = x

sustituir:

5.48 g/g =     x           ·      100

                ``````````````````

                (x + V solvente)

5.48 g/mL  · (x + 37.2 mL) = 100 x

5.48  x + 203.86 g = 100 x     (agrupar x)

100 x - 5.48  x = 203.86 g

           94.52  x = 203.86 g     (despejar x)

                  x = 203.86  / 94.52

                  x = 2.16 g de soluto (CaCl2)