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Quiz de Química: fórmulas, moles y átomos

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Quiz de Química: fórmulas, moles y átomos

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Rendimiento medio en química

Created by

Lorena Loaiza
Lorena Loaiza
Ecuador

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Quiz de Química: fórmulas, moles y átomos
 

Quiz de Química: fórmulas, moles y átomosOnline version

Rendimiento medio en química

by Lorena Loaiza
1

Un compuesto tiene 40% C, 6.7% H y 53.3% O. ¿Cuál es su fórmula empírica?

2

Si la fórmula empírica es CH2O y su masa molar es 180 g/mol, ¿cuál es la fórmula molecular?

3

¿Cuántos moles hay en 24 g de NaCl (M NaCl ≈ 58.5 g/mol)?

4

¿Cuántos átomos hay en 2 moles de O2?

5

Número de Avogadro: ¿cuántos átomos hay en 1 mol de cualquier sustancia?

6

Porcentaje de Fe en Fe2O3 (M ≈ 159.69 g/mol): ¿aprox. cuál es?

7

Moles de CO2 si se tienen 3.5 g y M CO2 = 44.0 g/mol

8

Cuántos átomos hay en 0.5 moles de H2O?

9

Moles de Cu en 12.6 g, con M(Cu) ≈ 63.5 g/mol

10

¿Cuántos átomos hay en 0.75 moles de Ne?

Explicación

Se convierten % a moles y se obtienen proporciones C:H:O = 1:2:1.

Masa empírica 30 g/mol; 180/30 = 6; repite la fórmula empírica 6 veces.

0.410 mol = 24 g ÷ 58.5 g/mol.

Cada mol de O2 tiene 2 átomos; 2 mol × 6.022e23 × 2.

Por definición, 1 mol contiene 6.022×10^23 entidades.

Fe: 2×55.85 = 111.7 g; 111.7/159.69 ≈ 0.699→70%.

0.5 g equivale a 0.5/44 ≈ 0.011; con 3.5 g es 0.0795 mol.

Cada molécula tiene 3 átomos; 0.5×6.022e23×3 = 9.03e23.

0.199 mol = 12.6 g ÷ 63.5 g/mol.

0.75 × 6.022e23 × 1 (Ne es solo 1 átomo por molécula).

 
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