% p/v ejercicio ayúdenme por fa
Respuestas a la pregunta
% p/p = peso soluto x 100
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peso solución
p solc. = p soluto + p solvente
p soluto = x
sustituir:
5.48 g/g = x · 100
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(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)