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Química: moles y moléculas

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Química: moles y moléculas

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Ejercicios de estequiometría

Created by

Adri Flores
Adri Flores
Ecuador

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Química: moles y moléculas
 

Química: moles y moléculasOnline version

Ejercicios de estequiometría

by Adri Flores
1

¿Cuántos gramos hay en 18 moles de magnesio?

2

¿Cuántos moles están contenidos en 36 g de óxido de calcio (CaO)?

3

Se tienen 2,4 g de cloruro de calcio (CaCl2). Qué cantidad de esa masa corresponde unicamente al calcio?

4

Un estudiante afirma que en cualquier muestra de amoniaco (NH3) la masa de nitrógeno siempre será mayor que la masa de hidrógeno. ?Es correcta su afirmación? Demuestralo utilizando una muestra de 34 g de amoníaco.

5

Un recipiente contiene 22,4 L de nitrógeno (N) en condiciones normales. Si la tercera parte del gas escapa: a) ?cuántas moléculas quedan en el recipiente?

6

Cuántas moléculas están contenidas en 0,75 mol de CO?

7

1) ¿Cuántos moles hay en 12.0 g de C (masa molar 12 g/mol)?

8

2) Masa de 0.25 mol de agua

9

3) ¿Cuántas moléculas hay en 2.0 mol de CO2?

10

4) 24 g de CO2 equivalen a cuántos moles?

11

5) ¿Cuántos gramos son 0.75 mol de NaCl ?

12

6) ¿Cuántos moles hay en 100 g de H2O?

13

7) ¿Qué representa 1 mol en química?

14

8) Cuántos gramos son 0.75 mol de NaCl (M = 58.5 g/mol)?

15

9) ¿Cuántas moléculas hay en 3.0 mol de O2?

16

10) ¿Cuántos átomos de H hay en 2.0 g de H2?

Explicación

Divides la masa entre la masa molar para obtener moles.

Moles por masa molar: 0.25 × 18 = 4.5 g.

Usa 2.0 × 6.022×10^23 moléculas por mol.

Moles = masa / masa molar (44 g/mol). 24/44 = 0.5455.

0.75 × 58.5 ≈ 43.9 g.

Moles = 100 / 18 ≈ 5.56.

Un mol contiene 6.022×10^23 unidades elementales.

Repite pregunta 4 para refuerzo de moles a gramos.

3.0 × 6.022×10^23 = 1.8066×10^24.

2 g de H2 son 1.0 mol; cada molécula tiene 2 átomos H.

 
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