Quimica

MATERIA:
QUIMICA
ESCRITURA Y BALANCE DE ECUACIONES QUIMICAS

3.52
Tanteo
a) Cu(NO3)2 + 2KOH Cu(OH)2 +2KNO3
Cu 1 1N 2 1X2
K 1X2 1X2
H 1X2 2
O 2+6=8 2+6=8


b) BCl3+3H2O H3BO3+3HCl
B 1 1
Cl 3 1X3
H 2X3=6 3+3=6
O 1X3=3 3Algebraico
a b c d f
c) CaSiO3 +6HF SiF4+CaF2+ 3H2O
Ca a = d 1 1Si a = c 1 1
O 3a = f 3 3
H b = 2f 6 6
F b = 4c + 2d 6 6
a = 1, b = 6, c = 1, d = 1, f = 3

a bc d
d) (CN)2+4H2O H2C2O4+2NH3
C 2a = 2c 2 2
N 2ª = d 2 2
H 2b = 2c + 3d 8 8
O b = 4c 4 4
a = 1, b =4, c = 1, d = 2






3.54
Tanteo
a) As4 S6+9O2 As4O6+6SO2
As 4X6=24 4X6=24
S 6X6=36 1X6X6=36
O 2X54=108(36X2)+36=108
*Se Simplifican (divididos entre 6)
b) 2Ca3(PO4)2+6SiO2+10C P4+6CaSiO3+10CO
Ca 3x2=6 1x3x2=6
P 2x2=4 4Si 1x6=6 1x3x2=6
C 1x10=10 1x10=10
O 10+8=18+10=28 7+3=10+9=19+9=28











Algebraico
c) 3Fe+4H2OFe3O4+4H2
Fe a = 3c 3 3
H 2b = 2d 8 8
O b = 4c 4 4
a = 3, b = 4, c = 1, d = 4

d) 6S2Cl2+16NH3S4N4+S8+12NH4Cl
S 2a = 4c + 8d 12 12
Cl 2a = f 12 12
N b = 4c + f 16 16
H 3b = 4f 48 48
a = 6, b = 16, c = 1, d = 1, f = 12