Química 5 CPDM (Examen rápido)
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Chemistry
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Professional Development
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Isaac Olivarria
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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Calcula la masa molar expresada en gramos de permanganato de potasio (KMnO4).
Pesos atómicos: K=39 g/mol, Mn= 55 g/mol, O=16 g/mol
220
158
110
83
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
¿Cuántas moles de metano (CH4) existen en una muestra de 125 g?
Pesos atómicos: C= 12 g/mol, H= 1 g/mol
4.27
6.32
7.81
8.69
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
¿Cuántos gramos de HNO3 son necesarios para obtener 2.5 moles de este compuesto?
Pesos atómicos:
H= 1 g/mol
N= 14 g/mol
O= 16 g/mol
25.2 g
15.75 g
157.5 g
252.5 g
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
¿Cuántos moles de cobre hay en 285.4 g del metal?
Peso molecular:
Cu=63.55
22.4 moles
0.224 moles
0.445 moles
4.49 moles
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Determine el % p/p de 45 g de NaCl en 250 mL de agua.
18 %
20 %
17 %
5 %
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Determine el % V/V de 125 mL de etanol en 355 mL de agua.
35.2 %
30 %
42.5 %
5 %
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
¿Cuál es la molaridad de 45 g de glucosa en 500 mL de agua?
0.5 M
1 M
2.5 M
0.75 M
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