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Quiz: Masa Molecular

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Quiz: Masa Molecular

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Conoce la masa molecular

Created by

Renata Mily
Renata Mily
Mexico

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Quiz: Masa Molecular
 

Quiz: Masa MolecularOnline version

Conoce la masa molecular

by Renata Mily
1

¿Qué es la masa molecular de una molécula?

2

¿Qué unidad se usa para expresar la masa molecular en química?

3

Una molécula de agua H2O tiene masa molecular aproximadamente de:

4

¿Qué contiene la fórmula bruta para la masa molecular?

5

¿Cómo se obtiene la masa molecular a partir de una fórmula empírica?

6

¿Qué afirma la masa molecular de CO2?

7

Si una molécula tiene masa molecular 58.44 g/mol, ¿qué compuesto podría ser?

8

¿Qué indica la masa molecular en reacciones químicas?

9

Una molécula de glucosa tiene masa molecular aproximadamente de:

10

¿Qué información NO aporta la masa molecular?

Explicación

La masa molecular es la suma de masas atómicas de todos los átomos que componen la molécula.

La masa molecular se expresa en unidades de masa atómica (u).

La masa molar del agua es la suma de masas atómicas: 2×1.008 + 15.999 ≈ 18.015 g/mol.

La masa molecular se calcula sumando masas de todos los átomos según la fórmula.

La masa molecular requiere convertir la fórmula empírica a masa con la información de la fórmula molecular.

CO2: C 12.01 + 2×16.00 ≈ 44.01 g/mol.

58.44 g/mol corresponde al NaCl (23.0 + 35.45 ≈ 58.45 g/mol).

La masa molar facilita convertir entre masa y cantidad de sustancia (moles).

La glucosa (C6H12O6): 6×12.01 + 12×1.008 + 6×16.00 ≈ 180.16 g/mol.

La masa molecular da masa relativa, no la representación 3D de la molécula.

 
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