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Datos

  • Carga elemental (ee) : 1,602⋅10−19 C1{,}602\cdot10^{-19}\,\text{C}
  • Constante de Avogadro (NAN_A) : 6,022⋅1023 mol−16{,}022\cdot10^{23}\,\text{mol}^{-1}
  • Unidad de masa atómica (uu) : 1,661⋅10−27 kg1{,}661\cdot10^{-27}\,\text{kg}
  • Constante de Faraday (FF) : 96490 C mol−196490\,\text{C}\,\text{mol}^{-1}
  • Constante molar de los gases (RR) : 8,314 J mol−1 K−18{,}314\,\text{J}\,\text{mol}^{-1}\,\text{K}^{-1} =0,082 atm dm3 mol−1 K−1= 0{,}082\,\text{atm}\,\text{dm}^{3}\,\text{mol}^{-1}\,\text{K}^{-1}
  • 1 atm=760 mmHg=1,013⋅105 Pa1\,\text{atm} = 760\,\text{mmHg} = 1{,}013\cdot10^{5}\,\text{Pa}
  • 1 cal=4,184 J1\,\text{cal} = 4{,}184\,\text{J}
  • 1 eV=1,602⋅10−19 J1\,\text{eV} = 1{,}602\cdot10^{-19}\,\text{J}

3Opción A

2 puntos
Apartado 3

Responda a una de las dos preguntas propuestas (3A ó 3B). Debe responder todas las cuestiones de la pregunta elegida. No se pueden combinar cuestiones de las dos preguntas.

Con el fin de abrillantar una superficie de aluminio se prepara una disolución acuosa de ácido fluorhídrico (HF\ce{HF}) disolviendo 4,5 g4{,}5\,\text{g} de ese ácido en agua hasta un volumen total de 500 mL500\,\text{mL}. Calcule:
Datos
  • Ka=6,7⋅10−4K_a = 6{,}7\cdot 10^{-4}
a
El grado de disociación.1,5 pts
b
El pH.0,5 pts

Tabla periódica

Mostrar
1. Tabla periódica de los elementos
Grupos
Períodos123456789101112131415161718
11
H\ce{H}
1,01		2
He\ce{He}
4,00
23
Li\ce{Li}
6,94		4
Be\ce{Be}
9,01
ZZNúmero atómico
XXSímbolo
ArA_rMasa atómica relativa
5
B\ce{B}
10,81		6
C\ce{C}
12,01		7
N\ce{N}
14,01		8
O\ce{O}
16,00		9
F\ce{F}
19,00		10
Ne\ce{Ne}
20,18
311
Na\ce{Na}
22,99		12
Mg\ce{Mg}
24,31		13
Al\ce{Al}
26,98		14
Si\ce{Si}
28,09		15
P\ce{P}
30,97		16
S\ce{S}
32,06		17
Cl\ce{Cl}
35,45		18
Ar\ce{Ar}
39,95
419
K\ce{K}
39,10		20
Ca\ce{Ca}
40,08		21
Sc\ce{Sc}
44,96		22
Ti\ce{Ti}
47,87		23
V\ce{V}
50,94		24
Cr\ce{Cr}
52,00		25
Mn\ce{Mn}
54,94		26
Fe\ce{Fe}
55,85		27
Co\ce{Co}
58,93		28
Ni\ce{Ni}
58,69		29
Cu\ce{Cu}
63,55		30
Zn\ce{Zn}
65,38		31
Ga\ce{Ga}
69,72		32
Ge\ce{Ge}
72,63		33
As\ce{As}
74,92		34
Se\ce{Se}
78,97		35
Br\ce{Br}
79,90		36
Kr\ce{Kr}
83,80
537
Rb\ce{Rb}
85,47		38
Sr\ce{Sr}
87,62		39
Y\ce{Y}
88,91		40
Zr\ce{Zr}
91,22		41
Nb\ce{Nb}
92,91		42
Mo\ce{Mo}
95,95		43
Tc\ce{Tc}
[97][97]		44
Ru\ce{Ru}
101,07		45
Rh\ce{Rh}
102,91		46
Pd\ce{Pd}
106,42		47
Ag\ce{Ag}
107,87		48
Cd\ce{Cd}
112,41		49
In\ce{In}
114,82		50
Sn\ce{Sn}
118,71		51
Sb\ce{Sb}
121,76		52
Te\ce{Te}
127,60		53
I\ce{I}
126,90		54
Xe\ce{Xe}
131,29
655
Cs\ce{Cs}
132,91		56
Ba\ce{Ba}
137,33		57
La\ce{La}
138,91		72
Hf\ce{Hf}
178,49		73
Ta\ce{Ta}
180,95		74
W\ce{W}
183,84		75
Re\ce{Re}
186,21		76
Os\ce{Os}
190,23		77
Ir\ce{Ir}
192,22		78
Pt\ce{Pt}
195,08		79
Au\ce{Au}
196,97		80
Hg\ce{Hg}
200,59		81
Tl\ce{Tl}
204,38		82
Pb\ce{Pb}
207,2		83
Bi\ce{Bi}
208,98		84
Po\ce{Po}
[209][209]		85
At\ce{At}
[210][210]		86
Rn\ce{Rn}
[222][222]
787
Fr\ce{Fr}
[223][223]		88
Ra\ce{Ra}
[226][226]		89
Ac\ce{Ac}
[227][227]		104
Rf\ce{Rf}
[267][267]		105
Db\ce{Db}
[270][270]		106
Sg\ce{Sg}
[271][271]		107
Bh\ce{Bh}
[270][270]		108
Hs\ce{Hs}
[277][277]		109
Mt\ce{Mt}
[276][276]		110
Ds\ce{Ds}
[281][281]		111
Rg\ce{Rg}
[282][282]		112
Cn\ce{Cn}
[285][285]		113
Nh\ce{Nh}
[285][285]		114
Fl\ce{Fl}
[289][289]		115
Mc\ce{Mc}
[289][289]		116
Lv\ce{Lv}
[293][293]		117
Ts\ce{Ts}
[294][294]		118
Og\ce{Og}
[294][294]
57
La\ce{La}
138,91		58
Ce\ce{Ce}
140,12		59
Pr\ce{Pr}
140,91		60
Nd\ce{Nd}
144,24		61
Pm\ce{Pm}
[145][145]		62
Sm\ce{Sm}
150,36		63
Eu\ce{Eu}
151,96		64
Gd\ce{Gd}
157,25		65
Tb\ce{Tb}
158,93		66
Dy\ce{Dy}
162,50		67
Ho\ce{Ho}
164,93		68
Er\ce{Er}
167,26		69
Tm\ce{Tm}
168,93		70
Yb\ce{Yb}
173,05		71
Lu\ce{Lu}
174,97
89
Ac\ce{Ac}
[227][227]		90
Th\ce{Th}
232,04		91
Pa\ce{Pa}
231,04		92
U\ce{U}
238,03		93
Np\ce{Np}
[237][237]		94
Pu\ce{Pu}
[244][244]		95
Am\ce{Am}
[243][243]		96
Cm\ce{Cm}
[247][247]		97
Bk\ce{Bk}
[247][247]		98
Cf\ce{Cf}
[251][251]		99
Es\ce{Es}
[252][252]		100
Fm\ce{Fm}
[257][257]		101
Md\ce{Md}
[258][258]		102
No\ce{No}
[259][259]		103
Lr\ce{Lr}
[262][262]
2. Constantes físico-químicas Carga elemental (ee) : 1,602⋅10−19 C1{,}602\cdot10^{-19}\,\text{C} Constante de Avogadro (NAN_A) : 6,022⋅1023 mol−16{,}022\cdot10^{23}\,\text{mol}^{-1} Unidad de masa atómica (uu) : 1,661⋅10−27 kg1{,}661\cdot10^{-27}\,\text{kg} Constante de Faraday (FF) : 96490 C mol−196490\,\text{C}\,\text{mol}^{-1} Constante molar de los gases (RR) : 8,314 J mol−1 K−1=0,082 atm dm3 mol−1 K−18{,}314\,\text{J}\,\text{mol}^{-1}\,\text{K}^{-1} = 0{,}082\,\text{atm}\,\text{dm}^{3}\,\text{mol}^{-1}\,\text{K}^{-1} 3. Algunas equivalencias 1 atm=760 mmHg=1,013⋅105 Pa1\,\text{atm} = 760\,\text{mmHg} = 1{,}013\cdot10^{5}\,\text{Pa} 1 cal=4,184 J1\,\text{cal} = 4{,}184\,\text{J} 1 eV=1,602⋅10−19 J1\,\text{eV} = 1{,}602\cdot10^{-19}\,\text{J}