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Vikentia [17]
3 years ago
8

Why is density a derived unit?

Biology
2 answers:
Triss [41]3 years ago
4 0
Density is a derived unit because it's not reported as a pure unit. (A pure unit would be something like kilograms or meters.) In contrast, the units for density are kg/m3. Density is the ratio of mass to volume; mass has the unit 'kilograms' (kg) and the unit for volume is cubic meters (m3).

Density is an intensive property, which means the amount of the material is irrelevant. The density of a substance is constant.

dalvyx [7]3 years ago
3 0

if one of the 7 exponents has value 1 and all others exponents are 0, then the unit being expressed is a base unit; otherwise it is a derived unit. Thus, for density we have: ... Density is mass divided by volume. Volume is already derived from length (measured in cubic meters - meter*meter*meter).

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Explanation:

Para responder esta pregunta, hay que tener en cuenta la Ley de Conservación de la Masa. <u>La misma indica que en una reacción química en un sistema cerrado, la masa total de las moléculas que participan permanece constante.</u> Esto significa que la masa utilizada en los reactivos es la misma que la masa de los productos generados.

En este problema, se cuenta con una solución de NaOH (hidróxido de sodio) tiene una molaridad de 0.204 (siendo la molaridad el número de moles por litro de solución) y se utilizan 16.4 mL de dicha solución para agregarla a 50 mL de una solución de H3PO4 (ácido fosfórico).

Entonces, ya que la masa de ambas soluciones no se pierde, podemos utilizar la ecuación de la Ley de Conservación de la Masa:

Concentración inicial x Volumen inicial = Concentración final x Volumen final.

Concentración inicial: 0.204 M

Volumen inicial: 16.4 mL

Concentración final: ?

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Reemplazamos los valores en la ecuación:

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La molaridad de la solución de H3PO4 es de 0.05 M.

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