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brookeanne723
05.10.2020 •
Chemistry
An object with a mass of 10.0g raises the level of water in a graduated cylinder from 25.0 mL to 30.0 mL. What is the density?
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Ответ:
density=mass/volume
density=10g/5mL
density=2 g/mL
Ответ:
Por definición de molaridad y densidad, la molaridad de la solución es 1.66
.
La concentración molar o molaridad es una medida de la concentración de un soluto en una disolución que indica el número de moles de soluto que están disueltos en un determinado volumen.
La molaridad de una solución se calcula dividiendo los moles del soluto por el volumen de la solución:
La Molaridad se expresa en las unidades
.
Por otro lado, la densidad es una magnitud que permite medir la cantidad de masa que hay en determinado volumen de una sustancia.
Entonces, la expresión para el cálculo de la densidad es el cociente entre la masa de un cuerpo y el volumen que ocupa:
En este caso, siendo H₂S el soluto, se colocaron 37 ml del ácido, siendo su densidad 1.36
. Reemplazando en la definición de densidad se obtiene:
masa= 1.36
× 37 mL
masa= 50.32 g
Siendo 34 g/mol la masa molar de H₂S, es decir la cantidad de masa que una sustancia contiene en un mol, la cantidad de moles de H₂S puede ser calculada como:
número de moles de H₂S= 1.48 moles
Siendo 890 mL=0.890 L el volumen de la solución, entonces la molaridad puede ser calculada como:
Molaridad= 1.66![\frac{moles}{litros}](/tpl/images/2567/4079/cba15.png)
Finalmente, la molaridad de la solución es 1.66
.
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